thats what I was thinking to actually..... I usually put the pressure at 5psi below the limitOriginally Posted by swampy1970 .
Do your Mavic rims have a note somewhere saying they'll take exactly 146psi before exploding and sending your nose to a grinding on asphalt death? 146 exactly?
I wonder if they took into account the lack of calibration across all the guages on track pumps.
Why do you pump your tires up so high?Originally Posted by finnrambo .
..... I usually put the pressure at 5psi below the limit...
146psi is not a nice round number because most of the world measures pressure in metric units of bar (approximately = atmospheres) or kilopascals (kPa) (1kPa = 0.01bar). 146psi just happens to be 10bar rounded to the nearest higher psi. psi are predominantly found in countries which still use imperial units or recently (in the last 40 years) left them behind.Originally Posted by swampy1970 .
Do your Mavic rims have a note somewhere saying they'll take exactly 146psi before exploding and sending your nose to a grinding on asphalt death? 146 exactly?
I wonder if they took into account the lack of calibration across all the guages on track pumps.
Originally Posted by etapedutour .
hi, not a guarantee here, but my hubby used to put 160 psi into clincher continental supersonics on mavic equipes. never had any blow outs or rim fractures
Originally Posted by daveryanwyoming .
Why do you pump your tires up so high?
IIRC you're a very light rider. From both a comfort and performance standpoint it's not a great idea to pump your tires as hard as they'll go unless you happen to be riding on extremely smooth surfaces like high quality wooden velodromes. On real world roads you reach a point where the extra tire pressure just slows you down even though those rock hard tires feel fast by transferring every little vibration. This is pretty easy to measure with a power meter equipped bike but here's a good piece discussing rolling resistance and the downside of excessive tire pressures: http://www.slowtwitch.com/Tech/What_s_in_a_tube__1034.html
FWIW, at 150 pounds I rarely get anywhere near the max pressure ratings for the tires or the rims if you weigh less you'd want less tire pressure not more for best comfort, best cornering, and best speed out of your tires.
-Dave
Originally Posted by daveryanwyoming .
Yep, both would be good ideas. If you follow the advice by Tom A, in the attached link a good approach is to inflate your tires till you feel the road buzz and they 'feel' fast....then back them off by a few psi so they actually are fast.
-Dave
You'll likely find that the steel rims on cheaper bikes will be a little more forgiving that the lightweight aluminum rims - but they'll also weigh a fair bit more and have fun when it rains stopping on steel rims with a nice chrome surface.Originally Posted by Olivier L .
actually it happens that tires cause rims to explode, rims being the weakest link... but yeah it doesn't happen that often and usually on cheaper bikes (like the chen shin road bike you can buy at zellers.
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