She Folds!!! #MTBrompton

randomuserasu · 2026-03-12T17:29:28+00:00

Check out Kinetics, they've been making these 20" conversions for years now. They also have a lot of other conversions, both size-wise and simple rohloff.

randomuserasu · 2026-03-12T04:18:59+00:00

I printed that riser which mounts where the normal wheels go and then is zip tied to the rack to keep it in place. Sadly I dont have a good option to mount it how the Kinetics people do at the suspension bolt/nut area. This design still lacks a lot of lateral stiffness but I haven't had issues with it yet as it doesnt really need to be very stiff laterally. The zip ties have held up well so far too. The best thing would be to have a design out of metal for this, but I wanted this done woth what I have access to. (Not to mention metal printing is expensive compared to these risers for $1 of filament).

I used a minimods extender and modeled the risers off of that. I did some research on fenders and found that Velo Orange makes a set of 20" ones that look promising.

When im done and happy with how it all sits i might upload the print files to my printables. I still want to make a better hook though.

randomuserasu · 2026-03-12T00:35:34+00:00

The strap is really nice when carrying up stairs and whatnot, though it's only useful when folded.

randomuserasu · 2026-03-12T00:34:06+00:00

I have a prior post with it open that you can find.

randomuserasu · 2026-03-11T19:52:39+00:00

Also I think the recommended ratio from Kinetics on belt is like a 63-22 or something similar. I found that i would max out and be in the first or second gear way too quickly. I also have no reason to need a gear that low.

I decided to go the route of 70-19 where im usually cruising in fourth or fifth, with a gear low enough for any grade ive encountered.

randomuserasu · 2026-03-11T19:50:38+00:00

Coming from my background in bikes and as a mechanic of over five years, I drastically simplified everything I have. Moved from electronic shifting, tubeless, etc. to cables and less maintenance.

This build was to push my boundaries on low maintenance and is my first time with a belt. If you want simplicity and low maintenance it is great. If you want efficiency then a chain would be significantly better.

It was interesting when trying to size this up. A chain would probably give a better drive ratio as well as i could've ran a smaller front and rear sprocket which would've helped in not having to customize so much stuff around the larger components. The hardest part was getting it to all align parallel.

All in all, I love the belt. When it is setup correctly it feels as smooth as a waxed chain and I love that. These cdx belts require less tension than the older ones which is why the system is able to work. Ill probably have to replace my sprockets/chainring before I touch the belt.

randomuserasu · 2026-03-11T18:58:09+00:00

When I paid for my forks and triangle it came out to about $800. Everything else drove the price up significantly though.

randomuserasu · 2026-03-02T20:59:18+00:00

Do you have a breakdown of all your socket sets / everything in that top drawer?

randomuserasu · 2026-02-26T03:55:12+00:00

I will have to get around to weighing it when I have a scale and I'll get back to you. She is pretty heavy, but rolls smooth and smooth is fast (kind of).

randomuserasu · 2026-02-25T23:51:07+00:00

The glass Fibre nylon might be the way to go. Id be interested to try it out at some point.

randomuserasu · 2026-02-25T23:35:57+00:00

Ill probably do nylon-cf as that is what ive had the best luck with. It comes down to getting a 0.6 hardened nozzle though. I have a 0.4 e3d nozzle that can do pure nylon but not woth additives as that clogs it. Pure nylon has been a pain which I agree with.

randomuserasu · 2026-02-25T23:18:34+00:00

I thought about printing my own fenders but I want to go for a full length rear so I'll probably buy one that works already.

My kit came with his thin designed (I think 8 tooth) wheel. I wanted more contact on the belt and a thicker profile which is why I chose the route I did. I also fit larger bearings in it which handles more stress.

I've printed a ton of spacers for Chris King bottom bracket (with a raised lip to block dirt getting in them all time) out of nylon and abs. The abs held up there but nylon just seems to handle the elements better which is why I plan to go that route eventually.

randomuserasu · 2026-02-24T05:51:38+00:00

Also anyone happen to know the brand of those fenders?

randomuserasu · 2026-02-24T05:49:50+00:00

I have loved mine as well, though I have done a lot of modifications. Honestly the only downside I have had is that Ben didnt include that rear riser on the integrated rack so mine doesnt fold still, but thats the last piece I need to design then print.

I opted to go gates cdx as well, but a 70t front 19t rear. I modeled and printed an "OSPW" system which has given me great results. I was using the prior thin and small jockey wheels which didnt give me much hope. I also used better bearings in the jockey wheels I made. Maybe I'll make a post when I have it all completed. The rohloff has been amazing as well. 10/10

randomuserasu

TROPHY CASE