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

2014-03-07 Coppell and Lewisville Ride

Was supposed to ride with Mike out in Justin, but I messed up my schedule (sleep deprivation) and he had a cut-off of 2pm (start at noon or earlier). I barely made it to a 3pm roll near my house. I feel bad about it, but I’m such a zombie that is was probably for the best.

I only had 4 hours sleep and 700 calories today including the ride fuel for this ride. I’m still not hungry, which probably has to do with having between 250 and 360mg of caffeine today.

This ride started into a monster headwind. The new wheels on my bike helped some because they flex less. Also, I re-centered my brakes, which made a huge difference. I didn’t realize how much they were dragging.

I have no idea how the watts is doing. It may be time to buy a power meter and expensive cranks just because.

Distance: 23.61 mi
Calories: 1,675 C

Time: 1:44:07
Moving Time: 1:42:28
Elapsed Time: 2:20:24

Avg Speed: 13.6 mph
Avg Moving Speed: 13.8 mph
Max Speed: 28.3 mph

Elevation Gain: 600 ft
Elevation Loss: 600 ft
Min Elevation: 562 ft
Max Elevation: 720 ft

Avg HR: 141 bpm
Max HR: 175 bpm

Avg Power: 441 W
Max Power: 1,283 W
Max Avg Power (20 min): 538 W

Avg Bike Cadence: 80 rpm
Max Bike Cadence: 123 rpm

Avg Temperature: 64.2 °F
Min Temperature: 61.6 °F
Max Temperature: 74.2 °F

Denton trek

From home to Teasley @ Windriver, and back. The little spur for Bishop Drive was disappointing. Satellite shows a gravel connector back to 2499 by a bridge sidewalk, but there’s a fence, gate, warning signs, etc. Ride out was good. Ride back was tolerable, but there is a monster hill in Copper Canyon, plus a few others coming back home that did me in. I had cold water in the pack, which kept me from getting too warm from the hills. I had a 180 calorie sport-food bar at the north stop. Still, when I got home, I had no leg power left. A little disappointed by this 20 mile/2 hour wall. I seem to have.

I think Saturday should be a ride down Morriss/Geralt to Spinks, then shimmy on the back roads and play around on the Grapevine NorthShore trails, though if I do that, I may need to either rest for an hour, or call for a rescue on the way back.

I’m trying to find a good groove for food. My gut usually doesn’t wake up until around 10am, so it’s hard to get down much for breakfast. Also, when I exercise, I lose appetite, so I have to set up waypoints/reminders (like midpoint). I’m pretty sure that 180 kcal isn’t enough for an hour of riding, but I’m not sure what to lug with me.

I dug up notes and researched again to confirm… I should be eating about 500 calories of carbs per hour while riding. That explains it. I probably had 400 calories total, half of it protein, including breakfast and the mid-ride snack.

The heat has been tough to tackle. Getting up at 5:30 so I can be out the door by sunrise is tough, but it’s a lot better to be finishing up while it’s 84F, than to be finishing up at 96F. Also, I’m using a 2L backpack. I’ll pack it full of ice, then add electrolyte and water. Even in the high 90s, it still has a little ice after 2 hours. I should probably get an electrolyte that has some calories to it. 110… “but it’s a dry heat, right?” heh. “Yah, sort of like that food left in the skillet too long.”