What derailleur goes with these shifters?

maxrodgers

Hello,

I have an old steel 10 speed. Yesterday I respaced the rear triangle from 120mm to 126mm and I've got a 7 speed shimano freewheel on its way. I'm looking at picking up a pair of Shimano ST-A070 levers as they are 7 speed brifters. I currently have a sun tour derailleur on which I will presumably have to replace. My main question then is; is there a specific derailleur I should get to go with these levers or will any 7speed capable Shimano derailleur do?

Also I realise the front shifter is also indexed, not friction so would I definately need to replace the chain rings or might my current ones work with the new system? Under what circumstances would they work/not work?

Are there any other concerns?

Thanks

Zerotails99

Yeah they will work fine.

maxrodgers

Thanks for the responses, that has eased my mind. So to clarify then will any crankset work with these brifters or does it need to be modern? I currently have shimano golden arrow double at the front, should this be ok? Also, my wheels are 27" rather than 700c, I can't see why it would be but is that likely to be a problem?

Thanks a lot.

skyd0g

The brifters, if indexed will define the amount of shift (cable release) between each shift, the derallieur unit will just move accordingly. So long as the max & min limits are set correctly, all else should work fine.