Originally Posted by
Clownbike
Let me put it this way...an 8 speed derailleur system uses a different chain than a 9 speed, etc. And every bike I've ever purchased had a too long chain, which leads to chain slap and possibly funky gear changes. When changing chainrings and cogs/cassettes, the chain length should be adjusted to fit the combo.
Both the 6-speed system and the 2-speed system use the same 2-speed derailleur with two gear cogs. The only difference is the hub. So I don't understand why chain width is an issue here. I have searched online and have found no mention of the need to change the chain. I think I'll try it out anyway.
Originally Posted by
Clownbike
Best thing to do is pick up Park Tool's Big Blue Book. It will help you understand bicycle engineering and how it relates to maintenance and modification. Which comes in handy even if you're not going to be performing the actual work.
Actually, I'm not a newbie; been doing my own bike maintenance for years. I'm very familiar with road and mtb derailleur systems. The Park Tool's Big Blue Book doesn't say anything about Brompton's unique 2-spd derailleur design. :-)