Tires for R60/2

Well just mounted my new tires and they don't fit. I copied my setup from my Guzzi which also took 3.50 x 18 tires. I mounted 110 in front and 120 in the rears but i guess the Guzzi has a very large fender bay.

Anyway, What is the correct or best tire size to use ? I am trying to understand the Barrington book and i am not sure if he is saying to go 3.5 in front and 4.0 in the rear

Any help appreciated. Best

Earles fork or US fork?

On the earles fork bikes the front and rear tires are 3.50 x 350 and should be the same tread pattern and interchangeable.

On the US /2 the front is a 3.50 x 18 and the rear is a 4.00 x 18. When you have a US front end bike ('68-'69) and you mount the 4.00 x 18 you might have to deflate the tire a little to get it past the left shock bolt & nut.

I don't know about the inch metric conversion for the tires on the /2 bikes so you have to keep searching for that.

Bench Mark Works has the tires you need for you /2, its your choice if you want a close replica or the high dollar replacement tire for the /2.

Size depends on rear drive ratio for rear tire

25/8 ratio stamp on rear drive use 3.50-18 tires both wheels solo bike

27/8 ratio stamp on rear drive use 3.50-18 tire front and 4.00-18 tire rear solo bike

Some examples:

http://www.motorcycle-superstore.com/20557/i/dunlop-k70-rear-tire?suggest=1&term=k70

4.00-18 Rear Tire

===
http://www.jpcycles.com/product/923-181

Metzeler Block-C 3.50-18 Front/Rear Tire

3.50-18 Front/Rear tire

I've been using the IRC GS-11 series on my R69S, 3.5 in front, 4.0 in back.

http://www.motorcycle-superstore.com/19086/i/irc-gs-11-all-weather-rear-tire