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Old 05-03-18, 09:59 AM
1nterceptor's Avatar
Join Date: Nov 2009
Location: NEW YORK, NY - USA
Posts: 4,735

Bikes: 2014 BMC Gran Fondo, 2013 Brompton S6L-X

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Originally Posted by reppans View Post

Thanks interceptor... saw your video before too - very helpful. Can I assume the Dura Ace 39T come in one standard bolt pattern (that matches the Brompton)? Also assume using a thinner chainring (for 10 speed rig) should be no problem with the wider(?) Brompton chain?
Brompton uses the common 130 BCD. A lot of brands/models will also fit; SRAM, FSA, etc. Not sure how a 10
speed ring will behave w/ a stock B'ton chain. I'd go with a 8 or 9 speed ring if you want to stick w/ the stock chain.

2013 Brompton DA chainring Ultegra chain by 1nterceptor, on Flickr
To the Op; and others who want to change rings but still have a protector. I've seen mods where owners put a smaller ring(38T, 39T, 40T);
which were designed to be inner rings. At the same time, they install the outer ring(53T, 52T, etc); but they file the teeth off. Presto, guard.
One day:
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