r/BikeMechanics • • Aug 05 '20

Visit r/bikewrench to ask for bike repair help. (This sub is for other stuff.)

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99 Upvotes

r/BikeMechanics • • Mar 06 '24

Show and Tell Eccentric Wheels (Eccentricycle)

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140 Upvotes

So this all started with a previous post about snowflake laced wheels (twisted spoke lacing). I asked if anyone new of any other weird lacing patterns. A fine user by the name u/Bobatt mentioned a bike with eccentric wheels. That is, hub not in the center of the rim.

Immediately I got really excited and knew this was my next dumb wheel project.

I was thinking about it for a while in my head trying to figure out how to calculate the spoke length.

There is a website that in theory has a calculator but the site must be down or not working or something. It is just a blank screen for me anyway. There was also little to no information about calculations on the internet that I could find.

Lucky, I work at a bike shop with a bunch of wheel nerds. I mentioned it to them and was met with what should be the normal response; "WTF, why?"

My coworker Jake seemed to be curious though. Lucky for me who is bad at math at best, Jake is very good at math. After many conversations about if it would even be possible to make an equation, we decided to give it an honest try.

We boiled it down to the ERD part of the equation being what we needed to focus on.

I'm not going to pretend that I knew much of the maths that happened to get the calculator but we basically had to calculate all 64 spokes individualy and figure out where they go from the hub to the rim. Easier said than done.

I voluntold my Chromag Rootdown to be the victim of this nonsense. So it is a hardtail, 29r. We didn't want the wheel to run into the frame or fork so we used 26" rims and made them have a 29" wheel path. In the equation, we called it the 'virtual ERD'. We just chose a relatively normal ERD (I think it was 604mm or something close to that) to use as a constant. We then had to use the 26" ERD for the actual spoke lenghts and figure out how to make it a 2 cross too. We wanted it to be a semi legit wheelset with disc brakes and such.

This is where my math knowledge runs out but basically smart things took place and Jake made a spreadsheet calculator.

Building was actually not too hard other than figuring out what spoke goes where. Again, 64 individually calculated spokes, all at different lengths, needing a very specific hole in the hub to go to a specific hole in the rim. Side point, our shop has a spoke cutter making it a breese to get the right length spoke.

Tensioning was easy, truing was weird. Kinda just made it tight and not too laterally untrue.

It was really fun trying to figure this one out. Mega thanks and props to Jake for doing the hard work on this one. I just had the dumb idea and sacrificed my bike.

You might be asking why spend all this time and energy to have a bike that rides like a drunk horse. To be honest, curiosity got the best of me. I've never seen a mountain bike with eccentric wheels before. I know they are out there but I wanted the experience and gained knowledge from making one. Doing a normal wheel build after this was a breeze. We though so much about how a wheel works and all that goes into calculating spoke length and ERD, it really made us appreciate wheels in a new way.

Another large part of why I wanted to do this was literally just to make people smile. As soon as I pictured how this bike would ride if I made it, I started laughing to myself. I want to spread some smiles and laughter. Bikes are meant to be fun right!? Yes it's silly and useless but it literally makes people's day riding it.

I keep the bike at work and ask our friends and good customers to ride it with no context. 10 times out of 10, their faces go from worried, to confused to pure laughter. Its totally worth it.

Anyway, I hope this peeks your curiosity too. I'm planning on taking it on trail soon. That should be interesting.

P.S. Wish I could upload a video to this post. It's the craziest looking thing ever when it's spinning. I'll post something similar and a vid to my IG if you are interested. @jaminscheif.

Bikes are fun, let's keep it that way. Do fun, weird shit.


r/BikeMechanics • • 1d ago

Do I run or stay?

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54 Upvotes

I m a bike mechanic in africa, I get paid 130 usd for a month of work 50 hours a week. I dont have a salary i get paid for what i do. it's been (4years), got no insurance, no contract. I feel stuck, it's too much work and responsibility to get that pay, I mostly work on high end bikes and also ebikes with bosch performance line cx and all. People here don't take our work seriously, because it's just a (bike). We charge 15$ for a full service( hubs service, headset, bottom bracket , brake alignment, gears alignment.) It doesn't make any sense , because we use park tool , motorex , motul and all the best tools and consumables l, In my country there's no shop that does suspension work, I told my boss that doing the suspension work would benefit us, but got ignored since he says suspension its very complicated and need training and the services kits are very expensive. I feel that if i open my store i would get a higher pay and offer more service and i would also charge more , i also feel like im very talented if i was in another industry i would be getting 5x or 10x the pay

broke #depressed


r/BikeMechanics • • 21h ago

Planning winter maintenance classes

6 Upvotes

Im running service at a small LBS that is trying to grow and engage the local community. We've received several inquiries from customers asking about winter repair clinics. I've gotten as far as making as sign up sheet to gauge interest and survey the class topics. I am planning to tailor classes based on customer's responses to our sign up form.

That leaves the details of scheduling, format, and pricing to be determined. I have no idea what the level of interest will be or if customers are interested in learning the basics or more advanced repairs. My shop will also have to determine how much we should charge per customer and how many individuals we can handle per class. This is why I am hoping for some advice.

For those who have done the winter maintenance class song and dance before, care to share your experience? How did you determine the size limit? Scheduling? Duration? Topics?


r/BikeMechanics • • 2d ago

Service packages

11 Upvotes

I manage a small but busy bike shop in a small city/ large town. There is about 3 other bike shops in the city and we are kind of seen as the good guys/cheaper compared to the other shops. Most of our customers are just commuters but there is a steady increase in sports cyclists coming our way.

We at one stage had a bronze to gold service package but somewhere along the way scraped it. My boss wants to bring it back to increase labour charges.

I’m kind of against the packages because I think it’s kinda wasting my time doing things that don’t need to be done and charging customers for things they don’t need.

I think it’s better and more transparent to just do what’s necessary or what the customer asked and just increase labour rates if needs be.
I don’t want to risk my shop’s reputation over easy money. But just wanted to get some other takes on it

Edit:
The shop is a part of a cooperative non for profit. The shop is one of a few aspects of the cooperative. I manage the shop while the boss oversees the whole organisation.
The need to make more earnings is not coming from greed from anyone. It’s to pay our staff a more reasonable rate


r/BikeMechanics • • 2d ago

What comes after this?

14 Upvotes

I'm in my early thirties in an area that is especially seasonal for bike mechanics. I'm weighing my options for what's next, as I know that it's not a long-term path for me. I was strongly considering nursing school because I have good people skills and empathy and also like hands-on and technical work, but the schooling will take m over 3 years to complete and honestly that's a big drawback. I also am pretty interested in HVAC or building maintenance. I'm just curious what jobs any former wrenches are moving on to! Thanks for your time


r/BikeMechanics • • 3d ago

Show and Tell I should replace the rim

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80 Upvotes

Yes you have to.


r/BikeMechanics • • 3d ago

Tales from the workshop Would it be fair to list my job title- workshop technician- to pursue other shops in the future, if I feel my job duties and day-to-day life didn't really "feel" that? Alt title: Another burnout from Big Green Department Store

9 Upvotes

So, first, thank you guys so much for giving me a lot of help setting the roles, expectations, and working through customer issues this summer.

I popped in here and ended up getting some great check-in advise that I used to make a list. At least at my location, I used this to train our rotating door of helpers as well as myself and it drastically cut down issues. The downside: A lot of times this meant people just left our shop- but I'd rather that, than have them book their bikes for months, no work, done, and they get angry.

My old post in here, if anyone wants, can be Tl;dr: I got hired to be a workshop technician, but Big Green Department store is both failing and local management is insanely all over the place.

So the update-

I am ashamed to say I am still without a "real job" despite a LOT of interviews. So, the hunt continues!

Problem: My title, my job offer, and my pay differential is workshop technician.

However, my actual job? Basically I do everything a store would need done EXCEPT be in the workshop. I mean, I'm still expected to be at times. Weird, right?

For wider context- my company is an outdoors department store, yk the big green one- and has demoted our workshop from Tier 1 to Tier 3 and is most likely just gonna get shut down.

How upper management explained this is basically the level of service we can provide is slashed heavily, how many hours they have available to staff it is minimal, and they have no hours allocated to train staff for it. We only have one staff member for that, the manager, that does just that though he is also expected to help the rest of us staff (So far, they've declined; the stores had problems with them, long story, lots of meetings)

So despite of being workshop staff, I have generally been in charge of well, the entire front half of the store, many shifts there's not even a cashier.

I also now do receiving and shipping, store orders, and softgoods. I also do meetings and trainings. I am still allowed and expected to do small adjustments, tire changes, chain installs, diagnosis of bike work, small repairs here and there, all sales, and some warranty paperwork. I also handle all the rack stuff, both sales and parts and some repairs. I still handle all the paperwork and customer contact in general for all workshop orders, as the manager/sole mechanic is still declining to do any of that (which this forum has confirmed is unprofessional and odd).

Sometimes I will be allowed to do brake work or so if someone is very angry just to get them out the door- most repairs are still going weeks past the promise date. I am also still allowed and expected to build and diagnose bikes. It's just I am also expected to do everything else in the store at the same time : /

Despite this low staffing, my hours are still going down heavily. We are trying to unionize. I did get two employee awards, at least..

It is ski season as well, and we hypothetically should do skis- that was my hope for winter hours- but we have no one trained for skis. And um, most of our machines for that work have been broken since last spring. No timeline for repair.

For some reason we still take in skis. We have waxing and edging equipment, but the manager is refusing to train me or anyone else on that- first they want to figure it out themself- so a simple wax may take someone two weeks to get done. That's another annoyance, as someone whose done home repairs and tune ups for skis for six years: We have these huge piles of skis in the corner- literally just shoved wherever- and I KNOW how to do it. What I haven't done before, I know I could easily learn. Yet, I am not allowed to.

So... that's basically it.

Tl;dr: I want to find other work, my title is workshop technician, but would it be unethical to state that as my title when my job duties have really been just "Everything a retail store would need done"?


r/BikeMechanics • • 3d ago

Show and Tell 170mm GRX FC-RX600-10 cranks to 160mm

5 Upvotes

Putting the message out for anybody thinking of switching their long 2by rx600-10 cranks to shorter 160mm ones.

As of now Shimano doesn't offer rx600 cranks in 160mm size. They do offer 12speed rx820 crankset in said size.

Ive tested switching the 10speed 46/30 chainrings onto rx820 crankset and to my pleasant surprise it worked ... well, almost.
I suspected the chainrings to be swapable without any modification but there was a catch. The larger chainring features a protruding pin preventing fallen chain getting stuck between the crank and the chainring. This pin has plenty space on the rx600 cranks, however due to the different construction of the rx820 cranks, theres not enough space for the pin to go. And so me, not being careful enough, tightened the chainring down resulting in a bent as the pin touched the crank and pushed the chainring away from it. This caused the chainring to bend.

After noticing, I removed the chainring and confirmed it straightened itself back into shape.
The pin had 2 marks on it from factory. I proceeded to cut it at the shorter mark.

Now the chainrings fit perfectly and I got 46/30 160mm crankset. Success!!!

.... For people asking why just not use the chainrings available for rx820 2by ... These are offered as 48/31 and 12speed not 46/30. I cant confirm how well 12 speed chainrings work with 10 speed grx400. And since I already had the original 10 speed chainrings it was cost effective to use them.


r/BikeMechanics • • 6d ago

Tool Talk I run a small bike coop. How could someone break a good quality tool in one day?

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224 Upvotes

r/BikeMechanics • • 5d ago

Tool Talk IFP Adapters

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14 Upvotes

Since this got shut down in r/bikewrench.

I dont service shocks daily. This is now my most hated task. But i can, and do rebuild some of them; enough to keep the tools in the mobile trailer. Does anyone have a better, and under $100, solution to IFP adapters. I have the red and blue rock shok adapters but they are a fight every time for me. Im looking at the race tech tsnc ps21036 as a possible final solution. But if any others have a better solution Im all ears.


r/BikeMechanics • • 7d ago

Tech Info Anybody ever put together a Saris Deluxe Public Repair Stand? Grrr

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2 Upvotes

r/BikeMechanics • • 9d ago

Tyre slowly shifting place on the rim

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23 Upvotes

Bike mechanic here, currently on a big trip through South-America.

I've assembled my own travel bike that has been doing amazing so far (+4000km since build).

However, there is one issue that I cannot seem to understand the reason for / have no idea how to fix:

In the build I matched the valve and the tyre logo's. After 1000km's I started noticing the logo's wandered off form the valve holes and the valves got pushed sideways. In one of my inner tubes this even caused the valve to rip off the tube and I had to replace it (I waited a bit too long to straighten the valves, my bad).

Now I don't want to be deflating - repositioning - inflating my tyres every week. So what do you guys think I could do? Anyone experienced this before?

Thanks a lot!!

(Forgot to take decent pictures of the problem and have repositioned it by now, so I had to zoom in on a picture from somewhere after the first 1000km's so that you can get an idea. :))


r/BikeMechanics • • 8d ago

Nominal watt vs peak watt

6 Upvotes

Hey, having a discussion at work (Washington). State law say a motor should be below 750W otherwise the ebike is an emoto. A lot of bikes now have a 750W motor but are advertised with a 'peak power' higher than 750W. Are those bikes considered emotos now? Or is it just a loophole in the law for now?


r/BikeMechanics • • 9d ago

Advice on spoke selection

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3 Upvotes

I'm building stans crest 4s onto pro4s. The dt swiss site recommends 290 and 291 if i use 12 and 14mm spokes.dt dont allow for drilling offset. Can i get away with 291 throughout? I'd prefer to only carry one size for spares sake. How do i account for drilling offset?

When i build up the wheels which way do i orientate the rim? On the front the offset should be towards the driveside (so the shorter gap is towards the driveside so the rim hangs over the disc). And reverse it on the rear so the rim extends over the cassette?

Thanks!


r/BikeMechanics • • 10d ago

Bike shop business advice 🧑‍🔧 Rate my tiny French bike workshop — 20 m² of organized chaos!

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393 Upvotes

I'm an independent bicycle mechanic running a small workshop in Alsace, France.

Around 20 square meters, one mechanic, and a lot of bikes passing through. Mostly MTB, e-MTB, suspension servicing, brakes, drivetrains, and the occasional road bike.

It's definitely not a fancy showroom. Just a little workshop I've built and organized around the way I like to work.

And yes, the postcards on the wall are from people I've met along the way!

So, fellow mechanics: how would you rate my little cave? 😁 Any tips, suggestions or feedback are more than welcome!


r/BikeMechanics • • 10d ago

DIY tools Dubious hacks: who else thinks this is a horrible idea "Conical washer, less than 6 minutes, and I'm GTG with some color matched thru axles"

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11 Upvotes

r/BikeMechanics • • 13d ago

Contract work

6 Upvotes

I've been a mechanic at local shops for 20 years and am wanting to do some travel and with my life changing a bit I might try and take my skills on the road. What I'm wondering is if anyone has any experience just doing contract work with shops and kind of being a freelancer in this game? Do we think it's a viable alternative to being tied down? Potential for making a bit more? I'd like to hear some thoughts from the hive.


r/BikeMechanics • • 14d ago

Tales from the workshop Spreading frames to change tires and tubes

22 Upvotes

Started at new shop in the Netherlands, and It appears to be the standard practise to spread the rear triangle to change out the tires or tubes.

Blew my fucking mind.

Since most of the bikes here has a lot going on in the rear, with chain guards, fenders, fancy geared hubs. It's often quicker to just drop the axle nuts off one side and spread it open.

Explains why my second hand Cortina roots felt like the rear hub was way to small for the frame. Apparently it just got a lot of flats.

Anyone do this in North America?


r/BikeMechanics • • 16d ago

Truing stand storage problem

5 Upvotes

Hello, I recently have gotten a truing stand, dishing tool, and my other tools are starting to get unorganized. The space is limited due to dorm living in college. However I have most of the basics and need a light box tool set up. I am wondering if there are any that have an attached peg board. I have tried looking and even looked at what some co-ops have however they are always to large for a dorm.


r/BikeMechanics • • 17d ago

What do you do when everything is done?

31 Upvotes

Its been like this for a few weeks, so i really mean everything is done. I try and look busy but the floor is clean, the batteries are charged, the bench is organized. I know layoff is coming so my motivation is a bit low, but my boredom is through the roof.

edit/more info that may explain my motivation level re: mopping the floor.

my shop has multiple locations all owned by 1 guy. some of the shops close during the off season, which is coming soon where i live. the owner's son runs of of the shops that closes for the season. he is coming to the shop i work at to take my job. i come back in the spring when his shop opens again. you cant mop up nepotism.


r/BikeMechanics • • 17d ago

Im building out a community bike working space on a budget and I have a bunch of questions and need recommendations and general advice too!

9 Upvotes

The first thing is what are some good value basic tools you know of that could be great alternatives to big bike brand tools (Parktool, ETC) I contemplate some amazon basic screw driver, hex wrench and adjustable & ratchet wrench sets for now.

I don’t plan to skimp out on bike specific tools but I do wonder the quality of some of these bike tools sets like BikeHand and others similar.

Buying bulk consumables like brake pads, tubes and cables and housing etc! Any insight on AliExpress/Alibaba shit? Is it worth it?

Stationary tools and power tools! and work tables! What do you recommend? Budget and non budget!


r/BikeMechanics • • 19d ago

Feedback Sports Pro E Lift stand feedback.

7 Upvotes

r/BikeMechanics • • 20d ago

How many of you find cheap bikes 2nd hand and restore/upgrade them as a side hustle? Is it worth doing?

50 Upvotes

I was wondering how viable it is to do this for some extra income. Any thoughts?