Tire sizes

This question will be slightly off the XJ topic, but still relates to motorcycles. If your stock tire is a 110/80/18, how would it affect the bike to go to a 110/90/18? I've been looking at tires for one of my other bikes (99 Nighthawk 750) and the front tire is a 110/80/18. For some reason, this does not seem to be a popular size, but the 110/90/18 is easier to find.

Now, before someone starts suggesting certain brands of tires that have the stock sizes, I've actually got my tires on order and I got the OE replacements. I'm just looking for information for future use.

Thanks in advance
Beardking

 

The 90 will be a taller tire and will throw off the speedometer and possibly affect handling. To get the approximate diameter of a tire multiply the width by the aspect ratio, multiply by two, divide by 25.4 to convert to inches then add rim diameter.
110x.8=88 , 88x2=176mm , 176*25.4=6.929+18=24.929.
110/80-18 tire=24.929" diameter
110/90-18 tire=25.79" diameter

 

Fozzie, I actually made an Excel file that does the calculations for me (I was using it while I was looking for tires).

So, how would it affect the bike if you went up to a 90 on the front and say an 80 on the back if the back is originally a 70?

STOCK
110/80/18= 24.92913386
140/70/17= 24.71653543

Non OEM:
110/90/18 = 25.79527559
140/80/17 = 25.81889764


I guess I'm just used to looking at truck tires where bigger is better as long as it doesn't rub anything.