Bike Tires & Pressure

This is reference info for me:

  • Pavement Reference: 700c, 28mm @ 120psi for 300 LB ride weight, 60% rear
  • Cruiser Reference: 32er, 55mm @ 60psi for 310 LB ride weight, 70% rear
  • Off-Road Reference: 700c, 40mm @ 40psi for 180 LB ride weight, 60% rear

Slower speed, butt off the seat, you can go lower psi. You’d be risking pinch flats on longer rides, or unseating the bead in harder turns, etc

Tread pattern is coarse for rough terrain, fine for sand & hardpack, and smooth for pavement.

Higher pressure prevents tire flex, and is better on pavement. – Less shock absorption, grippy on soft, loose surface.

Lower pressure increases tire flex, which grips obstacles better. – Increased risk of pinch flats, or rolling off the rim.

General width preferences:

  • Hardpack or pavement – narrow to prevent drag
  • Sand, pea gravel, mud – wide to prevent sinking
  • loose, large gravel – wide to prevent pinch flats, throwing gravel, etc

Weight Distribution

  • Cruiser ~ 70% rear.
  • Mountain ~ 60% rear.
  • Race Road ~ 55% rear.

Proportional adjustments:

  • Narrower tire for larger diameter
  • Lower pressure for lower weight
  • Lower pressure for wider tire

Rim sizes:

  • 559mm = 26er
  • 584mm = 650b / 27.5″
  • 622mm = 700c / 29er
  • 686mm = 32er
  • 787mm = 36er

First Road Flat

Had my first road flat today. Stopped on “Cripple Creek Ln” because of a tap tap tap on the rear tire. pulled out a 5/8 steel construction staple with blue plastic on it.

Pppssssssssssssss. center tread and easy to see. patch was okay, but the clear film on one dide of the patch does not come off. the foil side did, but the instructions did not say which side is the “backing” to remove.

It seemed to adhere and so both the tire and tube were patched, aired up, and still hard after another 5 miles.

Iphone says 25 miles, but based on my gps comparisons between this and ipad mini, I think this was more like 17.5 miles. Funny that after all this time, the crummy GPS is what makes me anxious to upgrade my pocket device.