Originally Posted by badmother
Hmm.. Need to pull out the bikestuff tomorrow to beat you to it I guess
. We`ll see. Got two solutions in mind. Just got hold of another 20" rear triangle from a "full suspension" childrens bike. Think I`ll post about in the utiliti forum.
Could you plse tell me about the rear der on Forrest? I have a 20" folder that came with a MTB type rear der. Switched it for another one but still big. I use only one front chainring on that bike so a medium reach would be enough. They should make der hangers suited for using a MTB der on a folder, a twisted version of this http://www.sjscycles.co.uk/shimano-r...-bolt-prod406/
The rear derailleur is a SRAM X7... despite my love for vintage parts there aren't many derailleurs that can handle the range of the bike this well. With my touring block installed I am running a 12-30 7 speed and the chain rings are 40/48/53 and can wrap up that 53/30 and still have leftover capacity and the chain wrap at the bottom end could not be any better.
The new rear triangle has proper drop outs and a hangar as well as cable guides, new V brake bosses, and threaded bridges with for clean fender mounting.
Last night I rode through the river valley and was bombing descents at 50 kmh and was climbing 12% + grades like they were not there and this is with one leg that does not participate fully... one climb out of the valley is 2km long with a grade of 10% - 12%.
In my bailout gear of 24 gear inches... for demonstration.
My new 7 speed Ultra block... built this up from my cog board and went with 5 closely spaced gears with two lower steps instead of running a tighter 6 with a huge step to the bailout. Even off the middle 48 I can get down to 30 gear inches which will get me up any normal grade here.
Climbed this... short but steep and covered in pea gravel over hard pack... it was too easy.
Coming down was a little trickier...
Last edited by Sixty Fiver; 05-31-12 at 12:56 PM.