A spinning wheel with a 30" drive wheel really isn't THAT much bigger than a wheel with a 22" drive wheel, right?
OK, so I measured and compared to Emma's Ashford Traditional wheel... Overall, a Schacht Reeves 30" Saxony wheel is 11" longer, 5" taller, and 6" wider.
That's not so bad.
(Stop it, Sue. Stop it, stop it, stop it.)