devocean Posted January 20, 2017 Posted January 20, 2017 I upgraded my dad's hybrid bike (road bike with flat mtb handle bars - because he has 'nothing to prove anymore' apparently) from a 8spd to 10spd drivechain I've got 10spd SLX mtb shifters with the rest (derailleurs, chain and cassette) all being 10spd Shimano 105. I've found that the mtb shifters shift too much per click and skip gears and the chain gets to the bottom of the cassette before i've clicked through all of the gears, as if it's expecting a wider cassette. Is there a way I can get this to work? What about if I got a mtb specific cassette? or would a mtb derailleur make it work? Many Thanks
Martin PJ Posted January 20, 2017 Posted January 20, 2017 Need an MTB derailleur. The ten speed MTB shifter and ten speed road derailleur are not compatible, as you see the cable pull is too much.
devocean Posted January 20, 2017 Author Posted January 20, 2017 Need an MTB derailleur. The ten speed MTB shifter and ten speed road derailleur are not compatible, as you see the cable pull is too much. But don't the shifters determine how much the cable is pulled?
Skinnyone Posted January 20, 2017 Posted January 20, 2017 But don't the shifters determine how much the cable is pulled?Yes they do but the RD geometry dictates how much it moves in relation to the amount of cable being pulled or released. The road and MTB derailleurs have different geometries - this is what you are experiencing.
devocean Posted January 20, 2017 Author Posted January 20, 2017 Yes they do but the RD geometry dictates how much it moves in relation to the amount of cable being pulled or released. The road and MTB derailleurs have different geometries - this is what you are experiencing. Ok thanks, that makes sense. So are you quite confident it'd work with the 105 chain and cassette if I just replace the 105 derailleur with a mtb one?
Jehosefat Posted January 20, 2017 Posted January 20, 2017 Yes, they do. But the cable pull from MTB shifters is too long for the road deraileur.
Ampandy Posted January 20, 2017 Posted January 20, 2017 There is a specific set of hybrid shifters that work on the 105 rear mech
Skinnyone Posted January 20, 2017 Posted January 20, 2017 Works perfectly on this bike.IMG-20170113-WA0004.jpgIMG-20170113-WA0001.jpgThat is 9 speed though...? IIRC the 9 speed stuff was never an issue, only when they went 10 speed did everything go belly up for compatibility. The cassette and chain should not pose an issue...
Martin PJ Posted January 20, 2017 Posted January 20, 2017 That is 9 speed though...? IIRC the 9 speed stuff was never an issue, only when they went 10 speed did everything go belly up for compatibility. The cassette and chain should not pose an issue... Yep, 9 speed road and with 9 speed MTB shifters are compatible.
devocean Posted January 20, 2017 Author Posted January 20, 2017 Ok thanks. Since I already have the shifters I'd prefer to go the derailleur route, I think finding a derailleur would be easier than finding those specific shifters for a flat bar. Just want to be 100% sure it's going to work before buying a mtb derailleur
Fruity Posted January 20, 2017 Posted January 20, 2017 Works perfectly on this bike.IMG-20170113-WA0004.jpgIMG-20170113-WA0001.jpgJust out of interest sake, what did it cost to have that done?
Allrounder Posted January 20, 2017 Posted January 20, 2017 as far as i know, sram has a 1 to 1 pull ratio, on raod and mtb.
Allrounder Posted January 20, 2017 Posted January 20, 2017 my wife has a cheap no name mtb derailer on her road bike, and it works perfect. I installed a bigger cassette (12 28) and her road derailer was unable to handle it. Took it in to the lbs, and they sorted it out, quick quick.
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