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Cyclocross - Cassette quest. add 11-34 instead of 11-25

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Erik_A

09-13-08, 09:16 PM

I just received my new Surly Cross Check with Tiagra and bar end shifters. In order to get better singletrack performance, I want to take off the rear 9 speed 11-25 cassette and dérailleur and replace it with an older MTB 9 speed Shimano Deore LX (RD-M571-SGS) dérailleur and a SRAM PG-950 9sp 11-34 cassette.

My question is whether the Shimano Bar-end (SL-BS77). 9-Speed Dura-Ace shifters are compatible with the MTB derailluer and cassette? Also, will I need to lengthen the chain going from 11-25 to the 11-34?

dzinehaus

09-13-08, 09:35 PM

Shimano SL-BS77 double/triple x 9-speed bar end shifters. Friction-compatible right lever
Drivetrain Spacing: Shimano/SRAM 9
FD/Shifter Compatibility: Shimano Road Triple,Mountain Triple,Shimano Road Double
Shifter/Rear Derailleur : Shimano

looks like its a go for the shifter/mtb derailleur, also I have a 11-23 on my bike and I had to shorten the chain... a lot! so I don't think the 9t diff is going to bug you so much in functionality as it would in appearance.. the long cage will just be more taught...

Erik_A

09-14-08, 08:28 AM

justinb

09-14-08, 11:04 AM

You will need to lengthen your chain. Use the Park Tool online guide for chain installation.

knobster

09-14-08, 02:37 PM

Yes. I have this exact same setup on a grocery getter I have.

sfcrossrider

09-14-08, 02:49 PM

I have the exact same setup on my training bike/commuter. Works great, especially when used as a mountain bike.

c_m_shooter

09-14-08, 06:17 PM

The original deraileur on my Cross Check clears an 11-32. I was putting a new chain on when I did the swap, so I don't know how much longer the chain is. If you are going to ride your Cross Check off road get a chain watcher It drops a lot in rock gardens and rough downhills.

Erik_A

09-15-08, 01:18 PM

Great, I assumed that the Tiagra medium cage would only be able to clear the rated 27t. I will also check the stock chain length, check this video recommending tight derailers:
YouTube - Cyclocross Bike Set Up & Gear : Advice & Chain Retention Tips for Cyclocross Biking

Also, what 11-32 cassettes do you recommend, I was looking at a SRAM PG-950.

The original deraileur on my Cross Check clears an 11-32. I was putting a new chain on when I did the swap, so I don't know how much longer the chain is. If you are going to ride your Cross Check off road get a chain watcher It drops a lot in rock gardens and rough downhills.