derailleurs for compact 10 speed-
08-31-12, 11:22 AM
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derailleurs for compact 10 speed-
I am wondering about these 10 speed compact setup with 50/34 in the front and 12-30 in the rear, does it required a different or specific types of derailleurs, especially for the rear where I have 12-25. Thanks.
08-31-12, 11:50 AM
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Nothing different for the front.
For the rear, if your existing derailleur is short-cage, it might not be able to handle a 30T sprocket. Or, even though the specs say it can't, it might just do it. Hard to say w/o trying.
Likely need a new, longer chain.
For the rear, if your existing derailleur is short-cage, it might not be able to handle a 30T sprocket. Or, even though the specs say it can't, it might just do it. Hard to say w/o trying.
Likely need a new, longer chain.
08-31-12, 12:03 PM
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As for the rear, there may be a clearance problem between the derailleur's upper pulley and the largest cassette cog. The "B" screw may not adjust far enough to gain enough clearance. You may be able to replace the screw with a longer one or put the screw in backwards to gain more adjustment. The cog size limitation depends partly on the geometry of the derailleur and derailleur hanger. Going from a 12-25 to a 12-30 may also require adding a link of chain (one inch).
As for the front, you will need to move the front derailleur lower and re-adjust the cable. I recommend that you refer to adjustment instructions found at Parktool.com. If your front derailleur is a "braze-on type" or if the seat tube has an aerodynamic shape there can be a real problem moving the derailleur low enough. If the FD is a clamp-on and the seat tube has a constant cylindrical shape then this should not be a problem. At the present time I think most people are using the same FD with a compact as used with a standard crankset.
As for the front, you will need to move the front derailleur lower and re-adjust the cable. I recommend that you refer to adjustment instructions found at Parktool.com. If your front derailleur is a "braze-on type" or if the seat tube has an aerodynamic shape there can be a real problem moving the derailleur low enough. If the FD is a clamp-on and the seat tube has a constant cylindrical shape then this should not be a problem. At the present time I think most people are using the same FD with a compact as used with a standard crankset.
08-31-12, 04:06 PM
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I just upgraded to the setup you're thinking of. I've got a 105 compact crankset paired with Ultegra 10 spd brifters and a Shimano 600 7/8 speed rear derailleur. The top (small) 3 cogs are a bit noisy but everything shifts just fine. I did have to crank the 'b' screw all the way in. The braze on front derailleur also needed to be moved down a smidge on its mounting bracket on the seat tube. I've got 1000 miles on it with out issue.
Oops. Just remembered when I upgraded the rear derailleur to 9 spd, I replaced the jockey wheels with 11 teeth ones
Oops. Just remembered when I upgraded the rear derailleur to 9 spd, I replaced the jockey wheels with 11 teeth ones
Last edited by coupster; 08-31-12 at 05:39 PM.
