Donger
Convoi Exceptionnel
- Location
- Quedgeley, Glos.
Good point. It can indeed. I find that 18.5 psi is just about optimal for me using Marathon Plus 32s as anything less tends to bulge and look flat.That road vibration is going through your hands. Lowering tyre pressures can reduce / eliminate the vibration pretty much.
There is also a rather surprising reason why I don't mess with my tyre pressures. I have a couple of identical cheap cycle computers which are the variety that require magnets to be fitted on the front wheel and calibration of the computers by reference to a manufacturer's table of numbers referring to wheel size, tyre size etc. I don't know if I'm alone in this, but the tabulation never seems to work exactly for me and I end up initially having to find the magic formula by trial and error.
The first time I did this, I fitted and calibrated my computers to the suggested settings, then did my regular bread and butter ride which I knew from previous measurement by bike and by car to be exactly 20.0 miles. On completion of that ride I looked at the mileage readout and worked out the deviation from 20.0 as a percentage and then re-calibrated the computer. I have discovered that tyre pressure has an effect on tyre dimensions and therefore wheel revolutions... affecting the mileage readouts by possibly as much as 5% for each 1psi either way. I made a note of the current tyre pressure, which was 18.5psi, and of the calibration number that I had programmed in to the computer. Every time I change a battery, I have to re-program it, so I enter the same tried and tested value and adjust the pressure to exactly 18.5 on the front wheel. I then do my 20.0 mile ride and check that it registers as such ... which it always does. I'm in no hurry to experiment with different tyre pressures and have to keep calculating the necessary amendments to the computer settings, and riding 20 miles each time to confirm that the computer is accurate!!
This has stood me in good stead when riding audaxes of 100km and more, with my read-outs exactly matching the official course distance totals. As I find 18.5psi quite comfortable, I think I'll stick with that! (Bet you never saw that coming while we were talking about mirrors!)