SpokePoke

I'm looking for a lighter/cleaner looking alternative to bolting on an aluminum chain guard to keep the chain from falling off to the outside on my 1x8 setup.

This would work, but I was hoping to find something lighter/simpler etc.



I was hoping one of these Brompton chain guards might work, but I'm not optimistic. Does anyone know if there is a way to make one of these fit on a non-Brompton 130 BCD chainring?





I realize there are a bazillion different chainrings out there. The chainring I would like to mount it to is a "standard" Shimano 53T ring.


Any ideas?

fietsbob

Quote:

The chainring I would like to mount it to is a "standard" Shimano 53T ring.

Just have to have a chainring you can drill holes in to mount those..

in a year maybe the spares for Bromptons new spider crank will be available
(54t probably , as their 3 chainring options, as currently, is 44t, 50t std, or 54t)

listed but not yet in stock , here: https://www.sjscycles.co.uk/brompton-...-54-prod31181/

I have a chainguard + chainminder on my Brompton, [removed stock BB & Crank]

Schlumpf includes one, and will make many sizes. mine;
His mountain drive.. a 54t 130 BCD

& another on the Bike Friday its a 53t, they get them made for their builds.

cplager

You can often put on a front derailleur with no shift cable. It's both cheap and effective.

dynaryder

Why not trace something out on a piece of plastic and make your own? Then just bolt it in place with chainring bolts for doubles.

SpokePoke

Thanks for all of the replies.

If it'll take a year for Brompton to release spares, that kind of rules that out. However, your the Mountain Drive looks cool! I had no idea those existed. Lucky!

Unfortunately, my seat tube is 41mm with no derailleur hanger so the front dummy derailleur is pretty much out. I would have liked to use the Paul Chain keeper, but it won't fit on my seat tube, nor will any other seat tube mounted keeper.

But, tracing my chainring onto some plastic...that might work! I think I'll try that out and see what happens.

Thanks again

fietsbob

Dragon Plate https://www.dragonplate.com/ sells carbon composite sheet stock too .

BruceMetras

J. Gaerlan used to sell a roller kit... I used it back in the day on my Xootr Swift (with a 41+mm seat tube).. adjusted properly, chain won't fall to the inside or outside of the chainring.

https://www.gaerlan.com/dahon/gear.htm

smallwheeler

nice!

jur

A simple light bracket which overhangs the chain in the position of the roller shown in the photo also works. Anything to arrest the sideways chain movement from shifting to a higher gear will do the job. I have used both a roller and a bracket.

cplager

If it were me, I'd figure a way to get a front derailleur mounted instead. Since you're not using it for shifting, it doesn't have to be mounted as securely as usual.

In normal operation, the chain wouldn't touch the derailleur, so there's be no additional drag. But if the chain decided to make a run for it, the derailleur would be there to keep it in its place.

GeorgePaul

SpokePoke: Try BBG Bashguards. They should have a lightweight bash guard that will fit your needs.

SpokePoke

Thanks GP, the guards offered by BBG look promising. I'll check them out!

SpokePoke

I agree in terms of function, but the real difficulty here is that my seat tube is 41mm in diameter and there is no brazed on derailleur mount. So then I would need to buy a special derailleur mount for this seat tube and then find a derailleur etc. I really want to go with a clean/simple/light setup.

But thanks for your input!

vmaniqui

how about this one: https://www.jensonusa.com/!Uk0uf5q19y...FYiDQgodqDgA4w