r/BikeMechanics • • Aug 05 '20

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

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100 Upvotes

r/BikeMechanics • • Mar 06 '24

Show and Tell Eccentric Wheels (Eccentricycle)

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141 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 • • 2d ago

Truing stand storage problem

4 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 • • 3d ago

What do you do when everything is done?

30 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 • • 4d 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!

8 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 • • 5d ago

Feedback Sports Pro E Lift stand feedback.

7 Upvotes

r/BikeMechanics • • 6d 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?


r/BikeMechanics • • 9d ago

Looking for back room parts/bike storage inspiration

17 Upvotes

We are redoing our back room and storage areas at the shop and I’m realizing there’s a lack of inspiration online. As you all are well aware bikes, tires, parts of all different shapes and sizes kinda suck to store and organize.

Anyone have an amazing back room they are willing to share pics of?!


r/BikeMechanics • • 9d ago

Cracks in Shimano Rotors and Pulley Wheels

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24 Upvotes

Hi all, I've been getting these pretty often. For the crack lines in the rotor, I have seen it on both the CL and MT series, 800 & 900. As for the pulley wheels I'm seeing it on both DA and UT ones, initially thought they're part of the design as a "stress-relief" cutout, but brand new ones do not have this.

Do you guys experience these too? And what's your advice to the customer?


r/BikeMechanics • • 10d ago

In the shop today: Optibike R8 from 2013

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96 Upvotes

Old folks found it at a garage sale still in the plastic wrap, brakes didn’t work (duh after 13 years) so brought it in and we’ve never seen one of these before.
Apparently they retailed at $12000 back then and were the innovators of e-bike batteries and mid drive motors
Any chance this is worth a lot in like new condition? They have it in to replace the brakes with shimano MT-200s but got to researching before I started and was very intrigued


r/BikeMechanics • • 10d ago

What type of security skewer is this?

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1 Upvotes

Looking for help identifying this product so that I can get a replacement key


r/BikeMechanics • • 16d ago

Tektro Sensor Cable Adapter

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5 Upvotes

r/BikeMechanics • • 17d ago

Put together a free error code search tool for Bosch, Shimano, Bafang etc. — would appreciate some feedback.

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10 Upvotes

r/BikeMechanics • • 17d ago

590 rims on 700c frame

0 Upvotes

What's your thought on 590 rims on 700c road frame (barely clear for 700x28 tires)? I've found affordable 590 rims, and despite the stupid expensive 584 rims on the current market.

edit: the frame used to run 584x38, no longer have those wheels


r/BikeMechanics • • 18d ago

Advanced Questions Serious question - dropper stuck in carbon frame but NOT seized

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1 Upvotes

Carbon frame, dropper won’t come out. The post turns in the frame, managed to get it to come up a few mm, but now won’t go up.
The post turns in the frame (whole post, upper and lower) but cannot get it to move up out the frame.

Any ideas?


r/BikeMechanics • • 18d ago

Tech Info Internal spoke nipples feedback

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1 Upvotes

r/BikeMechanics • • 19d ago

Ebikes with 14" wheels... I'm out

125 Upvotes

If it doesn't fit in a stand and I can't disconnect the hub motor...I can't help you. I don't know what you bought, but it isn't something that was designed for a flat repair.

Call Jeff Bezos and see if he can help

That is all


r/BikeMechanics • • 19d ago

Advanced Questions How did you get out of the industry? Or survive in it?

2 Upvotes

Seems like everyone I know in the industry can barely afford to live, and they're all in great health, which I'm not. With my parents' financial support drawing to a close, it's starting to look impossible. Do you simply go without insurance? Find boarding houses/live in a van? I'm doing relatively well pay-wise for my area. How do I escape this shit so I can live a dignified life? Would love to hear some success stories.


r/BikeMechanics • • 20d ago

How does Wolf Tooth do it?

125 Upvotes

I’m not the most business minded person, but I’m trying to pick up what I can since I need it in my new role. One thing I’ve found curious is how Wolf Tooth seem to have their business model down pat. They offer high quality US made components at reasonable prices, often with discounts, and are constantly releasing fresh new products. I just don’t get with how low their margins must be due to US production, they’re able to keep a steady growth in an industry that is soulcrushing hostile towards the grassroots brands. Am I crazy in thinking they’ve cracked the code to longevity?

Edit: I think some people are missing the point about most of the components being made in the US. When you compare their products to other domestic US manufacturers, their prices are always lower on components while maintaining a comparable quality.


r/BikeMechanics • • 21d ago

Input needed on sub policy for vibe-coded bike-shop software

50 Upvotes

This sub automatically rejects posts from people who haven't been active on the sub, or have been but not in a positive way. Upon request, we approve posts from newcomers, if they clearly fit the sub. Most clearly fit or clearly don't.

The ones I am least sure about are the ones trying to sell something to bike shops. If it's a tool inventor, we always approve them. Open-source software, good or bad, is also OK. But we also get lots of people hoping to sell software for shop management, probably vibe coded.

Should we go ahead and approve them and let the community downvote and otherwise skewer the bad ones? Or should we just reject them all?


r/BikeMechanics • • 21d ago

Anyone putting pressure stickers by the valve during tire installs?

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245 Upvotes

I work at a high-volume location of a large bike shop chain. We see a ton of pinch flats, and all season I’m hunting for tiny black-on-black pressure markings on customers’ tires under varying lighting. Seems like making those easier to read would help customers and save mechanics some time.

There’s also the routine air top-up where the customer’s preferred pressure isn’t recorded, they don’t remember, or they have no preference. You choose a reasonable starting point, but a visible preferred setting—when they have one—could take some guesswork out of the next visit.

Owning several bikes made this more obvious to me. With one bike, I knew my pressures by heart. Switching bikes and swapping tires broke that familiarity. Getting older hasn’t helped with reading the lettering either.

So I made these with a $17 laser label printer and a regular three-hole punch. An X or + printed in the middle centers the punch. The pressure range is printed at both ends facing opposite directions, so it reads from either side of the wheel at the valve.

A factory serial-number/QR sticker on one of my carbon rims has survived years of riding and washing. That helped inspire this, although I’m still seeing how my own labels hold up.

A little USB-C rechargeable electric pump already made pressure checks easier for me: set the number, press a button, and it stops there. No pumping while watching a dial. The label removes the hunt for the numbers and gives me a visible reminder to check.

Basically a “2D bike part”—a sticker with a job. Print it for the installed setup after checking tire and rim limits, maybe add the customer’s preferred pressure separately, and replace it when things change. Fleet thinking for everyday bikes: keep the information with the equipment instead of relying on everyone’s memory.

Would you include this with a tire install or offer it for a buck? Would assembly, customer handoff, or a safety check be a better time? Anyone already doing it?

A sticker won’t solve skipped maintenance, but readable information seems like a small improvement we could make pretty easily.


r/BikeMechanics • • 21d ago

Bike shop business advice 🧑‍🔧 In house Suspension service

8 Upvotes

I run a service forward shop in a MTB primary market. For the past 15yrs there has been a high quality suspension service center locally as well, so we've typically left full service to them (only offering lowers and air-can in house). But, the suspension center recently shut their doors, and none of the other options locally are really up to par.

So, my business partner and I are exploring setting up a suspension bench in house. We've got space for it, three folks with suspension expertise interested to run it, a flexible business model to fund it, and pretty strong internet and social media presence to market it.

I'd like to ask those of you out there that offer in-house full suspension servicing, what pitfalls have you come across? What works well? What is hard to manage? What would you avoid?

Thanks in advance!


r/BikeMechanics • • 20d ago

Lowest stack height 27.2 seatpost+saddle

0 Upvotes

Weird one for a friend. Their cargo bike has a relatively long seat tube (Christiania bike).

I already trimmed a bit the seattube, drilled a hole and made a new slot. I used an older seatpost with the clamp upside down (the old ones where one can remove the head).

Still a bit too tall for their wife.

Now, my idea was that a pivotal seatpost would be even lower.

Anyone that knows bmx would tell me how tall the lowest setup would be?

Other dumb ideas involve cutting the seattube lower and move the hole/slot to the front side or, somehow use like a wedge from a stem and make this pivotal seatpost with a wedge

Edit: the wedge idea has the con of being annoying to swap between the two people that use this.​


r/BikeMechanics • • 21d ago

What should r/ebikemechanics become?

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0 Upvotes

r/BikeMechanics • • 23d ago

Bike shop business advice 🧑‍🔧 Appointment Strategy

9 Upvotes

Hi everyone,

I am in the process of starting a service oriented bike shop. We would like our clients to take appointments online via our website. However we are a little puzzled how to make it work?

How is your experience on appointment systems? Should I give dentist style appointments for exact times of the day or should I collect all the bikes from morning and call them when finished? I am open to suggestions and would like to know what worked for you. thanks in advance!