can i move up\down in aspect ratio?

[Guest]

I find it difficult to find tires for my bike (in my country) importing is a bureaucratic hell.
the stock size is 3.00X18 front and 3.50X18 rear. this translate to 90/90-18 and 110/90-18.

If i'll move to 80 aspect ratio and fit 100/80-18 front and 120/80-10 rear i'm only loosing about 10 mm of ride height and i believe the rims will accept the slightly wider tires.
what effects will it have on handling etc...?

Same question for going up to 100% aspect ratio?

Thanks
Eran

[pete]

I use 100/90-18 front and 110/90-18 rear on mine and they're fine. I run Pirelli Sport Demons and love them.

Not sure how different the 80 series will be, but I think 120 width on the rear will be getting close to the chain.

[eran_k]

i found a set of 3.50 and 4.00 kenda k270 tires
the 3.50 is "rear" too, can i put it on the front?

[Steve]

You sure you want knobbies on your 400?

If you do put a rear tire on the front, be sure to turn it around so the "drive direction" arrow points the opposite way.

.

[Agemax]

you wont be losing 10mm of ride height. the middle number of the tyre size is a percentage of the tyre width, not a measurement.
a 90/90 height is 81mm (90% of 90) and a 100/80 is 80mm(80% of 100), so you only lose 1mm

[eran_k]

thanks,
yes i know it's a knobbie, it's the look i'm after (scrambler,tracker etc...)
so it should be no issue to use it on the front if i reveres it, good to know.
what about going 1 aspect ratio lower?

[Agemax]

why would you want low profile knobbies?

[eran_k]

you wont be losing 10mm of ride height. the middle number of the tyre size is a percentage of the tyre width, not a measurement.
a 90/90 height is 81mm (90% of 90) and a 100/80 is 80mm(80% of 100), so you only lose 1mm

your right off course,i was doing the math for same tire width with different aspect.
110/90 vs 120/80 will be 3mm, i gues i should be ok with 1mm front and 3mm rear?

[eran_k]

why would you want low profile knobbies?

i don't, just checking different option from the limited selection i have