Rear derailleur size

[GazK]

I'm now getting to the point on my summer project where I need to settle on rear mech and cassette sizes. It's a falcon tourer with a 40/50 chainset, and I'm looking to put either an 11-32 or 11-34 cassette on back. I've calculated the resulting chain wrap at 31 or 33 links. I assume that due to the large rear sprocket I'm looking at an MTB mech. Shimano Deore long cage has a chain wrap of 45 links. If I fit this will the derailleur arm sit too far back on small cogs because there isn't enough chain wrap?

 

[TheDoctor]

I'd have thought if the chain length is correct it'll work fine. I've used an Altus on a single chainring and a 12-32 cassette with no problems at all.
TBH I've normally found it quite tricky to get a Shimano rear mech doing anything other than working nicely...

 

[GazK]

I'd have thought if the chain length is correct it'll work fine. I've used an Altus on a single chainring and a 12-32 cassette with no problems at all.
TBH I've normally found it quite tricky to get a Shimano rear mech doing anything other than working nicely...

OK, ta - I'll go look up chain length setup.