Bike Forums - View Single Post - Can Shimano 105 Med cage, 10speed handle a 13-34 cassette ?

08-07-17 | 02:32 PM

#3

kcblair

Old Legs

Joined: Nov 2016

Posts: 1,212

Likes: 33

From: Mass.

Bikes: '80 Strayvaigin, '84 Ciocc Aelle-Shimano 105, '90 Concorde Astore /Campy Triple ,85 Bridgestone 500/Suntour, 2005 Jamis Quest, 2017 Raleigh Merit 1, Raleigh Carbon Clubman

Quote:

Originally Posted by rowebr

While the only definitive answer will be to try it, I am currently using a 105-5700 RD on an 11-34 10-speed XT cassette, with 50-34 chainrings, 10-speed Dura-Ace downtube shifters. I think I have ridden this setup for about 600 miles with no problems.

I sized the chain to make sure the drivetrain can handle the big-big combo. My small-small combo may be a bit slack, but if so that's not a big problem as I wouldn't be using that gear on purpose anyway.

If your 105 RD won't play nice with the 34 tooth large cog, you can swap it out for an older Shimano 8-9-10 MTB derailleur like the Deore M591. That should plug right in and work with your 10-speed road shifting and easily handle the 34 cog.

Thank you. I don't see why it wouldn't work, too. I would never use the small-small. To clarify, the 105 (5700 RD), is a 10 speed, but I'm using it with a 7 speed cassette and shifters (DT). The B screw can be turned in another 7mm, so the 34T should clear the jockey wheel. I was wondering if anyone has done this.

Sounds like that 34T works with your 105 GS RD. I'm guessing you had to turn in the B screw some ??

THanks. KB

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