flesh_pile
06-12-08, 03:45 PM
So here are my options/questions/dilemmas with a little bit of background info. After putting two track days behind me, I'm thinking about wheel/tire choices. Here is what I have available to me for the front wheel:
1. Aerospoke tubular wheel with glued Continental Sprinter (170psi max, measures 23mm)
2. Real Desing Supersonic clincher (60mm deep rim) with latex tubes and Michelin Pro2 Lights (115psi max, 23mm - measures 24mm)
3. Unused/unmounted Veloflex Record (145 psi max, measures 20mm)
Here are my questions:
1. What can happen if you overinflate tubulars? There is no rim for it to blow off of. Does it just explode out of the casing? I have heard that there is probably a 50% safety margin built into the max psi of most clincher tires for liability reasons so I'm assuming the same holds true for tubulars. I've been running 130-140psi in my 115psi Michelin clinchers with no issues the past two weeks.
2. Could I run my Veloflex Records at 145+ psi in my Real Design rim? I know rims probably have a max psi rating before they break but the tire is so narrow and contained anyway as it's a tubular I couldn't see any adverse effects from the tire pushing out the rim a tad. The only thing that I could see would be some adverse reaction on the tire itself as the bead of the rim pushes into the tire. I've been stretching my Record on a clincher rim this past week in anticipation of mounting it on a true tubular rim at some point in the future and it seems to be working fine now. I have not ridden on it but I can't see why or how it could fall out of the rim - it's in there pretty deep and will require tire levers to get it out.
3. What setup would you recommend? The Pro2 Lights/latex have the lowest rolling resistance compared to the others at the same psi, but the tubulars can go to higher pressures and negate this savings. Plus the tires are pretty wide compared to the tubulars. The Real Design rim shape is more aero than the Aerospoke rim but it has spokes that stick out into the wind while the Aerospoke only shows the width of the tire to the windw. I would think at the 0 degree yaw angle that I'd be racing at the benefits of both would probably cancel each other out.
By the way, I do not want to take off and reglue the Record tire on the Aerospoke as of right now.
Thoughts?
1. Aerospoke tubular wheel with glued Continental Sprinter (170psi max, measures 23mm)
2. Real Desing Supersonic clincher (60mm deep rim) with latex tubes and Michelin Pro2 Lights (115psi max, 23mm - measures 24mm)
3. Unused/unmounted Veloflex Record (145 psi max, measures 20mm)
Here are my questions:
1. What can happen if you overinflate tubulars? There is no rim for it to blow off of. Does it just explode out of the casing? I have heard that there is probably a 50% safety margin built into the max psi of most clincher tires for liability reasons so I'm assuming the same holds true for tubulars. I've been running 130-140psi in my 115psi Michelin clinchers with no issues the past two weeks.
2. Could I run my Veloflex Records at 145+ psi in my Real Design rim? I know rims probably have a max psi rating before they break but the tire is so narrow and contained anyway as it's a tubular I couldn't see any adverse effects from the tire pushing out the rim a tad. The only thing that I could see would be some adverse reaction on the tire itself as the bead of the rim pushes into the tire. I've been stretching my Record on a clincher rim this past week in anticipation of mounting it on a true tubular rim at some point in the future and it seems to be working fine now. I have not ridden on it but I can't see why or how it could fall out of the rim - it's in there pretty deep and will require tire levers to get it out.
3. What setup would you recommend? The Pro2 Lights/latex have the lowest rolling resistance compared to the others at the same psi, but the tubulars can go to higher pressures and negate this savings. Plus the tires are pretty wide compared to the tubulars. The Real Design rim shape is more aero than the Aerospoke rim but it has spokes that stick out into the wind while the Aerospoke only shows the width of the tire to the windw. I would think at the 0 degree yaw angle that I'd be racing at the benefits of both would probably cancel each other out.
By the way, I do not want to take off and reglue the Record tire on the Aerospoke as of right now.
Thoughts?
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