Boxerworks.com

Yes, done alot of searches, but there seems to be some confusion (maybe just me ) on correct tire sizes.
I've seen 3.25 front and 4.00 rear said to be available in the BT-45s, but I can't seem to find them.
I now have Lasertecs 3.25f/4.00r. Want to order the correct size BT-45s.
Can someone help me clear this up?

100/90 X 19 and 110/90 X 18 are a substitute that can be used and are sometimes more readily available than our sizes. The metric sizes shoild be used as a pair as they are slightly smaller in diameter than the 3.25X19 and 4.00X18.

You should allways try and find the real specs for any tire before puchasing as the real world measurements vary from one manufacure to the next, even though they have the same size stamped on the tire.

I've read that the Bt-45s run on the small side, as in 'very skinny'.
The 4.00 Metz fits with just the right clearance on the rear, no rubbing.
so...yes, trying to find out if the 110 would be too skinny or the 120 to big or 'just right'.

Rapid Dog wrote:Yes, done alot of searches, but there seems to be some confusion (maybe just me ) on correct tire sizes.
I've seen 3.25 front and 4.00 rear said to be available in the BT-45s, but I can't seem to find them.
I now have Lasertecs 3.25f/4.00r. Want to order the correct size BT-45s.
Can someone help me clear this up?

Yes - Bridgstone manufacture a 3.25 x 19 BT45 and a 4.00 x 18 BT45 specifically for BMW twins. Recxommended pressure is 2.5 bar and 2.8 bar respectively. I've previously fitted them to an R100S and have a pair currently on my R90S and no complaints.

That's weird, I can't find any in those sizes...

Another popular option are Avon Roadriders. http://www.avon-tyres.co.uk/motorcycle/roadrider

I have them on all three of my bikes and am VERY happy.

You could always ask them directly:

BRIDGESTONE/FIRESTONE NORTH AMERICAN TIRE, LLC TIRE SALES CO.

P.O. BOX 140990, 535 Marriott Drive, Nashville TN 37214
Phone:1-615-937-3442, Fax:1-615-937-3431

Personally I think the BT45 is a better tyre than the Avon. I will however be fitting Pirelli Sport Demons in metric sizes when I put my tuned R90S on the road.

I've noticed that a lot of the more modern design tires (like the BT-45) have sizes listed by the manufacturer for 30-40 year old bikes, but those sizes are often unavailable from the vendors.

Major Softie wrote:I've noticed that a lot of the more modern design tires (like the BT-45) have sizes listed by the manufacturer for 30-40 year old bikes, but those sizes are often unavailable from the vendors.

Could be a continental US thing M.S. - the sizes I mention are readily available over here in the UK and Bridgestone UK have gone further than most current tyre manufacturers by actually recommending the BT45s in those sizes for fitment to old airheads. Avon UK don't actually recommend any of their tyres for my R90S, which suggests they're happy to let me fit Roadriders, but the buck stops with me.

Replacement trye for the Michellin Mac50 rear called a 'pilot activ' available in a 4:00x18

Michellin claim improved performance and durability over the Mac50.
Don't know if they're in Aus yet.

Keen to try 'em tho!

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