Velocity Aerohead (Road) Replacement Rim?
07-23-21, 09:11 PM
#26
Really Old Senior Member
Exactly!
I can't believe all the lemmings that think a test on a 20" diameter drum is going to have a contact patch resembling that of a flat surface.
The drum is obviously going to favor the more supple sidewall.
I expect a supple sidewall to be "better", but not to the degree the test leads some to believe.
A better test would to be roll the bike down a ramp with a chronograph located at a point where the bike is just off the ramp on the level surface and another at a measured distance away.
Make "n" passes for an average.
Compare the % lost between the 2 points.
Last edited by Bill Kapaun; 07-23-21 at 09:15 PM.
07-24-21, 09:53 AM
#27
Mad bike riding scientist
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You are technically correct in that the hub, spokes, rim are stiff enough not to affect compliance (suspension). However, the road-tire-rim interface DOES affect compliance and ride quality. Changing from a 20 to a 23mm rim width significantly affects the profile (shape) of the tire cross section hence its compliance and contribution to ride quality. The same thing happens in your car with low-profile tires.
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Stuart Black
Plan Epsilon Around Lake Michigan in the era of Covid
Old School…When It Wasn’t Ancient bikepacking
Gold Fever Three days of dirt in Colorado
Pokin' around the Poconos A cold ride around Lake Erie
Dinosaurs in Colorado A mountain bike guide to the Purgatory Canyon dinosaur trackway
Solo Without Pie. The search for pie in the Midwest.
Picking the Scablands. Washington and Oregon, 2005. Pie and spiders on the Columbia River!
07-24-21, 06:34 PM
#28
Full Member
Thread Starter
Well, I actually switched to the old, narrower rimed spare wheels and went for a 68 mile ride today.We had some good asphalt and some really terrible chip & seal. Running the same pressures that I had recently been running on the A23s I noticed a definite improvement in ride quality but it is not nearly as much as what I remember after originally switching to the A23s. I suspect that this is because I was still running too much pressure in the A23s at the time. Looks like I need to find some better tires with more supple casings.
