For maximum performance, the inflation of a tire is determined by its size and the weight on it. I think Michelin has a chart on their web site.
Too hard, you may gain some speed, but the ride is harsh and the tire won't hold the road well in turns. The sidewalls won't deflect as much as they are supposed to.
Too soft, and the mushy ride will bog you down and make handling dangerous. Too much sidewall deflection.
By the way, at the same psi, a skinny tire will give a softer ride than a fat one. To take advantage of a wider tire, you have to reduce the pressure.
I think that 105 psi is too high for 700x28c tires with a light load. But whatever floats your boat.
By the way, since more weight is distributed to the back tire, it should have higher inflation than the front.
The psi statement on the tire is only the maximum pressure the tire can safely hold.
Louis Schulman Tampa, FL
Peter Weigle wrote:
> David said,
>> and run these at 105 psi. I would say it put the
>> original feel back into the 30 year old McLean criterium. The tires ride
>> smaller than they look and I can live with the look. No noticeable
>> in rolling resistance and the combo has smoothed out the rough edges
>> of some of the roads around here.
>> Mission accomplished with this switch and highly recommended.
> Dave Boston
> Tucson AZ USA
> I run my GB 28's at 85-95 and find they fly right along, I weigh the
> same as David.
> At that pressure the ride is almost as spirited but way more comfortable.
> I did try them at higher pressure but didn't feel I gained much, except
> highway buzz.
> Nice to know you have a choice.
> peter weigle
> lyme, ct