Bike Forums - View Single Post - Brompton- Switching to 39T, noob questions

10-10-19, 11:57 PM

#5

fishgirlcycles

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Join Date: Jul 2018

Location: East side of the Emerald City

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Bikes: Liv BeLiv 1 (2018), Mosaic GT-2 (custom, 2019), Brompton S6L (2018)

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Quote:

Originally Posted by 1nterceptor

1. Correct.
2. I try to match the chain w/ the chainring(10 speed to 10 speed, 9 speed to 9 speed, etc.)
If your chain is not too old and want to reuse it; I'd try to find a 8 speed ring.

I went w/ a 10 speed ring(Shimano Dura Ace 39T) and 10 speed chain(Shimano Ultegra):
https://www.youtube.com/watch?v=5AT6...IoDLA&index=33

2013 Brompton DA chainring Ultegra chain by 1nterceptor, on Flickr

Thank you! Your videos are so helpful (and better than the official Brompton ones)

Quote:

Originally Posted by 2_i

No, the rear sprockets on Brompton are fairly thick, while having a wider chain than the minimal for a ring goes with impunity. Sure 8sp ring would be better, but once you put too many specifications into your search you come up with an empty list.

So, 8-speed chain so long as I'm using the stock Brompton rear sprockets. Got it. Thanks!

I'm waiting to hear back from a company selling the Stronglight chainset--130 BCD (I think) 39T, has a chainguard, and 165mm cranks which would match the length on my full-size bike. I think the numbers all still work out, but hoping they can confirm.

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