1"? 26mm"? I know it's smaller than 27mm...

Thanks!!

15/16" gets it.

But I can't get that bolt off... It's torqued on there but good. I don't have air tools. I have a breaker bar and a strap wrench, but the wrench won't hold. Gonna have to get a bigger set of channel locks...

Got it with PB Blaster, pipe wrench, breaker bar, and 2 cheater bars, and my 16 year old daughter (she REALLY wants to drive it tomorrow!). Now for the crank pulley. It's slowing down now...