Rear derailleur size

[joelectric]

Got a trek marlin 5 with a Bbshd kit fitted to it.
I am trying to change my 7 speed cassette size from 12-32t to 11-36t for more range. The standard derailleur Shimano Tourney TY300 that is fitted says it only works up to a max 34t.

Can someone recommend a 7 speed derailleur that will work with a 11-36t cassette?

Thanks

 

[Oldie]

My 8 speed Shimano Acera apparently only does up to 34T yet it works fine on my replacement 36T.

 

[Raboa]

You could put on a deriualler hanger extension or change one of your front chainrings.
Some people think Shimano are conservative with their deriualler capacities, they can cope with more teeth than stated

 

[sjpt]

The stated ranges often allow for inappropriate big front to big rear gear setting. You'll almost certainly be OK with a few teeth bigger at the back as long as you are happy with some odd grindings if you (inadvertently or in an emergency) do go big to big.

 

[Nealh]

A couple of extra teeth one may get away with though one might have to likely add a link to the chain length in case of tight chain stretch in BIG/BIG configuration.
One can try adjusing the B screw out to gain a bit of capacity.
Or as mentioned use a hanger extension quite cheap as a few quid for some of them.

 

[joelectric]

Thanks for all the replies, i will order up a hanger extension and some extra chain links, as this seems to be mentioned a few times, and stick with the original derailleur.

 

[chris_n]

You won't need the hanger extension, just screw the 'b' screw in until the change to bottom gear is smooth. Don't mess about with extra chain links, just buy a new chain.