Originally Posted by GiantRoadie
I'd love to do this too... I think the smaller wheels on MTB might not work as well, but I'm really curious to see if this'll work well... I've got the perfect cantidate with a great shimano exage (I think) drive train but I'm not sure if I can use it with drops and new levers... but then, what road levers would work with an older MTB 21 speed (I think
) Drive train? Does anyone have experience with this?
The derailer cage needs to match the cogset\ring size, road or mtb. Speeds are in the shifter function.
If you mean to run 700 wheels, the brake caliper mounts mtb become useless. The front brake mount if you have a crown drilled (rigid) fork should be correct for mounting a road\XC caliper brake. (Mine is)
Rear brake needs the seatstay brace to be in the correct position also (mine is) though, my strut is tapped only one side lower, facing the tire, I would have to drill the brace through the side facing out and back to mount the road caliper.
Then unscrew the canti-boss anchor tubes.
Putting drops and such you'll have to be creative for levers, barcons would be cool, index shifters though?
Since mtb don't have downtube shifters, the barcons sound best to me.
Gearing...well a larger cluster =different drailer cage.
Some mtb F-derailer cages accept a few more teeth.
A triple to double switch will need the bb\axle to be swapped to run the double\chain line to the cluster centered.....I believe?
If your front was 24\34\42 you can enlarge the middle ring no problem (other than a big chain drop) as it is the sm\lrg that the cage measures.
If the derailer can take a 26\36\46 or something like that, you can start hauling @$$. also the 12-28\30\32, just pull the 12 cog off the cluster and put an 11 on for topspeed.
11 to 46 would take a real he-man to run for any time XC. I can just
run 38 by 11 offroad, constant flatland it's o.k.
The reason I'm probably not going to run 700 is my 11 by 38 gearing max at 80 rpm, the speed difference between 26 and 700 was 1.1 mph. Big deal. and I lose my near indestructable 26 rims for skinnies that restrict my ability to really take advantage of offroad.
I might try keeping the 26 wheel and using a reversed mustache and road lever, barcon setup soon if i can find some nice road brake levers -more as an advanced 'flat bar\bar extension\bull. Having a smooth curved bar would give me more positions. Might need dual brake levers? The brake lever position is what I cannot decide on. V-brakes for the 26 wheel dictate the levers will be on the top\flats, not the ends.
Also, the handlebar collars for mtn brakes are not the same size as road bar collars, road bars are wider.
So there are compatibility issues for brakes in using different lever types.
It can be done..not easily..or at least not without some planning.
Well that's my musings on it, sorry its not well edited, written.