custom tires for geo metro (motorcycle tires?)

[Christ]

If your steering is still too "heavy" for you, you can change the steering feel by changing the caster angle of the front wheels, which can be accomplished in several ways using the stock parts, at least by a few degrees.

If you use MC tires on your car, you will have next to no wet traction, a higher RR figure in many cases, and a fairly slide happy front end, assuming you're using a MC tire that's thinner than the OE Metro tire.

There are car tires that are thinner than the Metro's, but you just don't find them that often. Maybe some place like Coker Tire would have them? Some cars came with 10" rims and tires.

You could also get highway-rated trailer tires, but you still end up with higher RR and such.

If you do end up using MC tires on the front, you'll want to adjust the camber setting so that you can use the shoulders of the tire when steering, to make up for the leaning effect that motorcycle tires are designed to accommodate.

That will afford you the highest possibility of not sliding off the road at the first hint of wet or uneven pave.

[Bicycle Bob]

The Citroen 2cv uses 135 X 15. Many odd sizes are available for classics, but few are as efficient.

[Frank Lee]

Anyone that can build their own tires has earned my respect!

[beatr911]

Those 135 Citroen tires are only an inch and a half wider than a typical 100 width M/C tire. Heck a 155 section tire is only about 2 inches wider than the same M/C tire.

That being said, 100 width m/c tires made for touring, pumped up to 50 psi would provide a pretty darn narrow contact patch. Probably pretty low friction with the right tire choice. Tire longevity would be less than the car tires, but that's not the point.

For lowest steering effort go with thin small diameter tires and the lowesT vehicle weight possible. The longer contact patch of m/c tires acts like a rudder trying to keep the tire straight. Make sure the steering and suspension attachment points are very rigid. Body flex is a contributor to heavy, vague steering. Little 145x12" Metro doughnuts will do a fine job for what you're after.

[MadisonMPG]

Motorcycle tires are expensive, and wear fast.

I suggest you increase these in size...

[jonathan150cc]

Sounds like you just want to build a custom 3 wheeled vehicle using the Metro as the platform.

In that case, I think all work with motorcycle tires, or anything of that nature, would be completely custom and unless someone on this forum has done so, I don't know if they can be of any real help. The best advice would come from the maker of the car in that photo that you posted.