Advice needed - compatibility of shimano - triple to compact
I'm getting a new frame and was going to swap all my components from my current bike which has 105 shifters and derealieurs, tiagra cassette and some shimano triple chainring.
Decided I wanted to change to ultegra chainring and cassette but shop has told me that the 105 shifters and derealieurs I have, being from a triple, will not work. I thought I'd read that the 105 stuff was all the same, it's just set up for whatever - triple or compact?
Ideally I'd like to go 11 speed at the back too, but if I can only have 10 that's fine.
To replace the cassette and chainring would cost about £170. Shop saying that really I would have to swap the whole lot - an ultegra chainset with shifters, derailleurs and brakes and everything is about £450 though!
What's the best way forward?
Can a mod turn this in to a post from a wiki?
Not sure why this wants to be a wiki?
You can do it with the bits you have, but;
You might need to adjust the spacers on the bottom bracket a bit to get the chain line correct.
The front derailleur will need the shift screws adjusting to suit the new crank, for the price I'd get a double derailleur, they aren't that expensive.
The front gear cable will want the slack taking out of it, and possibly shortening a little.
The shifter will need setting up so the chain moves from the little to the big on the first shift position, the second shift position will not be used as the front derailleur upper limit screw should prevent the cable moving far enough.
The chain length should be ok as long as the two largest sprockets haven't increased in size, but if you are replacing the drivetrain, just make the chain as long as you need.
--
couple of extra points.
You can't go 11. Different levers, different pull ratio on the cable, hence different mechs.
Assuming you're already 10.. If not you need a different lever (but not mechs from 9)
The right hand lever is different for triple. That is all. You can set up a triple lever on double (but not vice versa), you just have a spare position as above. Or you can buy a double lever off ebay for not much cash. IMHO the feel/improvement of the successive ranges is mostly in the levers.
Different to the above, If using a triple shifter I would set up the doubles on 2 and 3 (mid and outer of the old triple). Then if you dump 1 too many it just rests on the limit screw, the cable goes slack and you need an extra handful to shift outwards.
If you set it up on inner-middle (1&2), you *can* snag the third position against the stretch/flex in the system (the limit screw notwithstanding, it is at a significant mechanical disadvantage). Problem then is that the (cast) pawl which holds the gear in is under an excessive amount of tension and doesn't want to release when you try to drop down.. but it does with a bit of brute force. Eventually it just fractures, and the lever is a throwaway.
Decided I wanted to change to ultegra chainring and cassette but shop has told me that the 105 shifters and derealieurs I have, being from a triple, will not work. I thought I'd read that the 105 stuff was all the same, it's just set up for whatever - triple or compact?
Ideally I'd like to go 11 speed at the back too, but if I can only have 10 that's fine.
To replace the cassette and chainring would cost about £170. Shop saying that really I would have to swap the whole lot - an ultegra chainset with shifters, derailleurs and brakes and everything is about £450 though!
What's the best way forward?
Can a mod turn this in to a post from a wiki?
Not sure why this wants to be a wiki?
You can do it with the bits you have, but;
You might need to adjust the spacers on the bottom bracket a bit to get the chain line correct.
The front derailleur will need the shift screws adjusting to suit the new crank, for the price I'd get a double derailleur, they aren't that expensive.
The front gear cable will want the slack taking out of it, and possibly shortening a little.
The shifter will need setting up so the chain moves from the little to the big on the first shift position, the second shift position will not be used as the front derailleur upper limit screw should prevent the cable moving far enough.
The chain length should be ok as long as the two largest sprockets haven't increased in size, but if you are replacing the drivetrain, just make the chain as long as you need.
--
couple of extra points.
You can't go 11. Different levers, different pull ratio on the cable, hence different mechs.
Assuming you're already 10.. If not you need a different lever (but not mechs from 9)
The right hand lever is different for triple. That is all. You can set up a triple lever on double (but not vice versa), you just have a spare position as above. Or you can buy a double lever off ebay for not much cash. IMHO the feel/improvement of the successive ranges is mostly in the levers.
Different to the above, If using a triple shifter I would set up the doubles on 2 and 3 (mid and outer of the old triple). Then if you dump 1 too many it just rests on the limit screw, the cable goes slack and you need an extra handful to shift outwards.
If you set it up on inner-middle (1&2), you *can* snag the third position against the stretch/flex in the system (the limit screw notwithstanding, it is at a significant mechanical disadvantage). Problem then is that the (cast) pawl which holds the gear in is under an excessive amount of tension and doesn't want to release when you try to drop down.. but it does with a bit of brute force. Eventually it just fractures, and the lever is a throwaway.