Rear derailleur

[TAV]

Hi I've got a tiagra 9 speed long cage but the jockey wheel is to close to the cassette I've adjusted the b screw all the way. I've got a 32 cassette on the back which is new do I need a mountain bike derailleur?

 

[Mike_P]

Likely to be a bent derailleur hanger - you need the right one for the bike. Have a look at
https://www.mountainbikecomponents.co.uk/product-category/derailleur-hangers/

 

[Spiderweb]

Hi I've got a tiagra 9 speed long cage but the jockey wheel is to close to the cassette I've adjusted the b screw all the way. I've got a 32 cassette on the back which is new do I need a mountain bike derailleur?

I have a Deore LX rear mech on my CX bike and had to buy a longer B screw to run a 36t cassette.

You could try this or get a rear derailleur extender link (link below but cheaper ones available on eBay;
https://www.merlincycles.com/sunrac..._medium=Affiliates&utm_campaign=genieshopping

 

[chris-suffolk]

I run a 105 long cage with a 34 rear sprocket, and it's fine. I'm guessing the geometry of Tiagra is the same as 105, so it should work.

 

[TAV]

I thought so aswell but like I said the jockey wheel cage is touching the cassette and the b screw is fully extended. Some guy told me to buy a larger b screw.

 

[TAV]

I have a Deore LX rear mech on my CX bike and had to buy a longer B screw to run a 36t cassette.

You could try this or get a rear derailleur extender link (link below but cheaper ones available on eBay;
https://www.merlincycles.com/sunrac..._medium=Affiliates&utm_campaign=genieshopping

Cheers for the link I could go down that route.

 

[chris-suffolk]

I thought so aswell but like I said the jockey wheel cage is touching the cassette and the b screw is fully extended. Some guy told me to buy a larger b screw.

I've read that you can put the 'B' screw in backwards. Can be a bit fiddly to turn (long nose pliers) but you should only have to do it once.

 

[TAV]

OK cheers for all the good advice.