How do I determine the proper tire pressures for the motorcycle front and rear and the sidecar? I realize that each rig will be different. Is there some kind of handling charateristic? I got Dunlop K591s on now. Front 36 psi (less wobble), 40 psi rear (stiffer), and 34 psi sidecar 13" trailer tire. Going to Metzeler ME880 Marathon 140/80-15 (lower profile) on rear and Avon Triple Duty MK II on front.
I put 32 in front,'[avon MKII triple duty] 34 on rear[metzler block K], and 23 in sidecar [13" auto]tires.
I usually go by the motorcycle and tire mfgs. recommendation for a loaded bike. An added sidecar is considered heavy loading. Since most motorcycle tires are not rated for side loading, it can get scary with underinflated tires.
If you have an automotive tire on the sidecar it will hold up to side loading better and can usually be inflated at or near the minimum recommended pressure.
Lonnie
A friend who sells tires tells me that your tire pressure should increase by 10% when warm. If you put 30 psi in cold, it should read 33psi warm. Adjust accordingly.
I also have had Avon MKII triple tires and the twin car radial that is available at Duantless motors.
I have gone by the mfgs. rec. like Lonnie does.
I also feel that its very important to check your often esp. before a long trip.
To add to Lenny's post:
I carry a digital tire guage on the road to maintain correct pressure on longer runs. It's easier on tires, gas, and my A**.
It's amazing how few riders there are that keep an eye on the tire pressure or even check it after a long layoff (Like in the spring after winter storage).
I've had several rigs and solos come into the shop with under 20# of air in the front tire and some with 0# in the sidecar tire. Usually with a tube type sidecar tire. The heavier tubeless auto tires seem to hold the pressure better.
The owners are usually quite surprised that air pressure isn't self sustaining in these modern times.
Lonnie
