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Recreational Cyclocross and Gravelbiking This has to be the most physically intense sport ever invented. It's high speed bicycle racing on a short off road course or riding the off pavement rides on gravel like :The Dirty Kanza". We also have a dedicated Racing forum for the Cyclocross Hard Core Racers.

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Old 09-13-08, 09:16 PM   #1
Erik_A
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Cassette quest. add 11-34 instead of 11-25

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?
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Old 09-13-08, 09:35 PM   #2
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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...
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Old 09-14-08, 08:28 AM   #3
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Originally Posted by dzinehaus View Post
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...
Thanks very much!
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Old 09-14-08, 11:04 AM   #4
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You will need to lengthen your chain. Use the Park Tool online guide for chain installation.
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Old 09-14-08, 02:37 PM   #5
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Yes. I have this exact same setup on a grocery getter I have.
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Old 09-14-08, 02:49 PM   #6
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I have the exact same setup on my training bike/commuter. Works great, especially when used as a mountain bike.
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Old 09-14-08, 06:17 PM   #7
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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.
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Old 09-15-08, 01:18 PM   #8
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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:

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

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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.
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