[Esprits1]

Hi
I recently bought a Ridley Noah Fast Disc with Shimano Di2 and was wandering can I swap the rear cassette which is an 11-30 for an 11-34. Is this a straight swap or will I need to change anything on the bike.

Topic

[fukawitribe]

Shimano are notoriously

Shimano are notoriously pessimistic about things like this, perhaps understandably, but given the R8000 GS will pull an 11-40 i’d be tempted to try your SS with the 11-34 first . Wind that B-tension screw in, or reverse it, and see what clearance you get on the top jockey – i’d hazard a guess that the chain wrap on the SS is OK if it’ll work perfectly on an 11-30.

[Rich_cb]

Yes.
Yes.

[Rich_cb]

As Chris Hayes said below
As Chris Hayes said below just get a road link, it’s very easy to set up and much cheaper than a new Di2 derailleur.

I’m using one with my mechanical Ultegra and it works perfectly.

[Esprits1]

Just had a reply back from

Just had a reply back from Ridley and my bike has the short cage rear derailleur fitted to it so i will need to change to the GS to use 11-34 rear cassette

[Chris Hayes]

I used a Wolf Tooth ‘Roadlink

I used a Wolf Tooth ‘Roadlink’ to extend my medium cage derailleur.  Costs about £25 and saves you a) replacing a derailleur and b) splitting your chain.  I thought that it might be a bit of a bodge, but it works very well.

I’d been running the 32 and the chain together for a few 1000 kms, so replaced my chain anyway.  There are plenty of chain length calculators online to help you with the exact number of links you’ll need. 

[Esprits1]

Just to try it can I use a
Just to try it can I use a wheel with a shimano 105 11-34

[mikewood]

Depends on the cage length.

Depends on the cage length. If it’s the longer one, Yes as that’s what I have on mine! If it’s the shorter one, probably not but might be worth a try if you know someone with one already fitted on a wheel.

[Judge dreadful]

11-34 will ( almost certainly

11-34 will ( almost certainly) take your drive train out side of the recommended tooth difference and capacity for that rear mech. You’ll have to get a hanger extender, and be careful about chain length. You may find it impossible to get a tension setting that allows you to use every ratio available as well.

[Author]

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