Widest and Narrowest tires on 18 x 2.15 wheels....

[tkent02]

Getting ready to put spoke wheels on the 750/1100 projectile. I have a nice pair of wheels, and an ugly set, so I have two rear spoked rims. Thinking about putting one rear rim on my front wheel, both ends of the bike would have 18 x 2.15 wheels.
Avon Road Riders, and I will be riding the hell out of them. Possibly Pirelli Sport Demons.

100/90-18 front and 120/90-18 rear sound about right? Is the 100 too skinny for the 2.15 wheel?

Would a 110 front and a 130 on the rear be too wide for the rear rim?

Any suggestions?

[Steve]

The stock front wheel on an '82 1100 is a 2.15 and it wears a 100/90 tire just fine.

The 130 rears usually fit on a 2.50 wheel, so I would think that you don't want to go over a 120.

Yep, sounds about right to me.

.

[Big T]

120/90 on a 2.15 stock rear GS 1000




Actually seems a bit too large as my chicken strip should only be about 1/2 that wide. I put it on just before the Shasta rally, so it got a good scrubbing in


That's the size I'd use

Up front, go 110/90 -18

[salty_monk]

Can't you put a 100/90/19 on the original front or are you specifically looking to lower the front end?

Dan

[tkent02]

Can't you put a 100/90/19 on the original front or are you specifically looking to lower the front end?

Dan

I could use those standard sizes, and I don't want to lower the front, just thought the smaller rims would make the steering quicker.

Not sure if it would have the desired effect, or just make it handle funny.
Anybody know?

[salty_monk]

It probably would & would move weight to the front a little although the fatter tyre might slow it down a bit too so prob come out about quits.....

[76FJ55]

I don't believe the front would be lowered significantly. looking at the BT45 as an example.

if you are looking at a 100/90-19 the diameter is 26.1"
the 110/90-18 diamter is 25.8"
the difference on the radius which would be the amount the front is lowered is only 0.15" which I think would be insignificant.

Bridgestone like most tire manufacturers will list the rime size each tire model and size is rated for. the BT45 in 110/90-18 is rated to fit rim widths 2.15-3.00

correspondingly if your rear is on the same 2.15 rim BS recomends the widest BT45 as the 110/90-18 as well. if you have a 2.50 rim then a 120/90-18 would be acceptable.

Brigdestone data can be found on thier website.

http://www.motorcycle-karttires.com/glamourindex.aspx?productID=3&LookupID=8

When choosing tires I would always reference the manufacturers data when trying to determine if a specific tire size will work on a given rim.

[LeeGS550E]

Are you going to relace it yourself?

[sschering]

I've been all through this with my Yamaha
Avon lists all the specs

http://www.avon-tyres.co.uk/motorcycle/roadrider

100-90-18 front is good for 2.15 - 2.75

110-90-18 will also fit 2.15-3.0

120-90-18 is 2.5 - 3.0

the 4.00-18 and the 110-90-18 are about as fat as they recommend on a 2.15" rim.