Join Date: Nov 2009
Location: Lander, Wyoming
Tire sizes are an approximation of tire carcass measurement, not tread measurement.
Any 2.75, 3.00, 3.25 inch will fit on a KLR front wheel as will any 80, 90 or 100 mm.
Installing a 2.75 inch or 80 mm tire will tend to 'flatten' the tire contact pattern on the road. Maybe better for flat-landers tread mileage.
Installing a 3.25 inch or 100 mm tire will tend to 'round' the tire contact pattern on the road.
I would recommend my same normal pressure (32-30psi) in any of them, or 2 psi Higher than what you use in the wider rear tires. The skinny front tire needs more psi to support the load, especially during proper braking (primarily front brake).
Modify at "YOUR OWN RISK"!
Still riding my 1987 KL650-A1. 84,000+ miles & counting