Stock tires are front 100/90-19.
I switched out to one size oversize a few years ago. A Challenger by Kenda in a 110/90-19.
It rides and handles well, and makes the speedo very close to accurate.
IIRC it was Knifemaker who pointed out sometime ago the odometer is accurate with the OEM size, and reads a few percent high with the oversize front tire.
The stock rear tire is 150/90-15.
Some/many members have reported installing 170/80-15 tires without problems.
The side walls are very close to the swing arms but do not rub.
I am not convinced the 750 NEEDS a bigger tire as the 1200cc Goldwings had the 150/90-15 size tire too.
The 1500 cc GW went up one size to a 160/90-15.
However having said that, I am going to the darkside in the next few days and installing a 165/80-15 car tire.
(The same size as fits the old VW Beetle.)
I have read a lot about it, and 90% of those who have tried it say they will never come back to a m/c tire on the rear wheel of a cruiser.
For any who may be interested here are some links.
Dark Wing--Darkside Gold Wing (car tire on a Gold Wing)
The Dark Side
Riding on the Darkside
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