mtb rear derailler and compact chainset

[ridesurlys]

Just checking if my theory works and what if any problems people experienced. I have got a 9 speed tiagra compact at the moment with a 28 rear cassette. I was planning on putting a 32 on the rear with a deore long cage rear derailleur. Will this be as simple as a swap or am i missing something. Thanks

[cycleruk]

Should be a simple swap.
Just check the chain is still long enough to reach over big ring and largest sprocket.

[Jay Gee]

I have done exactly that and it worked fine.

[ridesurlys]

Yeah will add a new chain. Thanks for the help