Yeah, those MK1 steering wheels are quite large at 15"+ and they're relatively deep dish too, didn't see much of a difference between my '86 and my '89. Grants are OK but I've got a $450 Momo Jet wheel in el perfecto shape for $300 with TOYOTA hub if anyone wants it.
i used to have a 11.5" wheel on my old mk1. it was bearable to turn with, but definitely tougher (esp running 205's). bigger problem was that it often got in the way of critical parts of the gauge cluster.
im using a 13" grant wheel now, and am quite happy with it for the most part. kind of wish that it was a bit further away from the turn signal/cruise stalk
I have used three different aftermarket wheels now (JDM toyota, Momo, TRD) and they are all really close to the turn signal, and when my highbeams are off, I cant turn properly. It really sucks. I am thinking of cutting and then fiberglassing my turn signal so that it is farther from the wheel.