Brompton gearing

[benjy_a]

I am increasing the gearing on my Brompton M3l as it is too low with my electric conversion, cadence is too high.

I have ordered a 54 tooth chainring and 100 link chain. According to the Brompton website I can also go from 13T to 12T on the rear sprocket with the 100L chain:

http://www.brompton.co.uk/extranet/downloads/Q_Parts_pdf/ds-chain.pdf

I cannot for the life of me find a 1/8" 12T rear sprocket anywhere....

Any ideas?

Thanks,

Ben

 

[shemozzle999]

Benjy_a,

12T sprockets will only fit single speed and the new Brompton Wide Ratio hubs.

I would buy a new 13T sprocket and see how you get on with that first.

All the new parts should be 3/32".

The 54T Chainset should solve your cadence problems unless you intend to exceed 15mph dramatically.

 

[benjy_a]

Benjy_a,

12T sprockets will only fit single speed and the new Brompton Wide Ratio hubs.

I would buy a new 13T sprocket and see how you get on with that first.

All the new parts should be 3/32".

The 54T Chainset should solve your cadence problems unless you intend to exceed 15mph dramatically.

Ah ok thanks....I thought I could use the 54T 3/32 chaining with 1/8 chain and existing rear sprocket? I'm guessing from your post that that is not the case?



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[jerrysimon]

Check these people out. Great service, good prices and you can ask questions to confirm before you buy.

Brompton Pedals, cranks, chainsets, chains, bottom brackets, chain tensioners and rear sprockets and spacers. - Brilliant Bikes

I run a 54T and 12T/16T on the two speed derailleur Brompton (no hub) as I want to keep it light. I need a 102 link chain for the 54T/16T.

I am pretty sure you can use an 1/8 chain as all the large rings are 3/32, but better off with the 3/32.

Regards

Jerry

 

[benjy_a]

Thanks Jerry,

Been reading a bit and it seems that it will be fine to keep my 1/8" components with the 3/32" chaining.

Ben