Why are pedals threaded RH on the right side, and LH on the left side? If the idea is to keep the pedals from working loose as you ride, I think they've got it backwards. The torque applied to the pedal shafts by the bearing friction, in the existing system, tends to loosen them. But that friction is so low compared to the tightness of a properly installed pedal that I don't think you could unscrew a pedal by spinning it.
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What am I missing? They used to have left handed lug nuts on cars, and they don't do that anymore. Could bicycle technology be THAT far behind?
Cars stopped doing that when they went to conical lug nuts. Bicycles could do likewise if they redesigned pedal spindles to have conical faces. This would have two benefits, one that the pedals would not unscrew, and the other that cranks would not break out in the pedal eye from constant fretting.
Cars stopped doing that when they went to conical lug nuts. Bicycles could do likewise if they redesigned pedal spindles to have conical faces. This would have two benefits, one that the pedals would not unscrew, and the other that cranks would not break out in the pedal eye from constant fretting.
I'm curious about that. I remember a car I had about 20 years ago which had centerline brand aluminum wheels. The lug nuts were not conical, but had a shoulder that fit inside the hole in the rim. Are aluminum rims still made like that? if so, are the left side lugs prone to loosening?
Why are pedals threaded RH on the right side, and LH on the left side? If the idea is to keep the pedals from working loose as you ride, I think they've got it backwards. The torque applied to the pedal shafts by the bearing friction, in the existing system, tends to loosen them. But that friction is so low compared to the tightness of a properly installed pedal that I don't think you could unscrew a pedal by spinning it.
Quoted message said:
What am I missing? They used to have left handed lug nuts on cars, and they don't do that anymore. Could bicycle technology be THAT far behind?
Cars stopped doing that when they went to conical lug nuts. Bicycles could do likewise if they redesigned pedal spindles to have conical faces. This would have two benefits, one that the pedals would not unscrew, and the other that cranks would not break out in the pedal eye from constant fretting.
link fretting & fatigue in terms that do not resemble mere coincidence if you please. just like your dye penetrant test that supposedly "proved" rim cracking was due to anodizing, you're missing huge lumping great parts of the picture here and drawing tenuous connections based on pure supposition. show us just one single modern campy or dura-ace crank that's broken at the pedal eye, and then try discounting improved metallurgy having elimiated the problem. the "fretting" issue of course remains identical on all modern era cranks as it does for the old ones on which you're relying for "evidence".
Cars stopped doing that when they went to conical lug nuts.
Chrysler continued to use LH threads with conical-face lug nuts as late as the '70s, long after Ford, GM and AMC had abandoned the practice. They dropped the practice when they began developing FWD vehicles, if I recall correctly. -- Typoes are a feature, not a bug. Some gardening required to reply via email. Words processed in a facility that contains nuts.
On Fri, 08 Apr 2005 22:36:23 -0500, Jim Smith <[email hidden]>
Quoted message said:
Quoted message said:
Cars stopped doing that when they went to conical lug nuts. Bicycles could do likewise if they redesigned pedal spindles to have conical faces. This would have two benefits, one that the pedals would not unscrew, and the other that cranks would not break out in the pedal eye from constant fretting.
I'm curious about that. I remember a car I had about 20 years ago which had centerline brand aluminum wheels. The lug nuts were not conical, but had a shoulder that fit inside the hole in the rim. Are aluminum rims still made like that? if so, are the left side lugs prone to loosening?
Some aftermarket rims are still made that way. It sucks. Yes, the left wheels tend to loosen. No automotive factory-original alloy wheel made in the past 30 years has used flat-face lug nuts, though it's possible that some heavy equipment and heavy truck wheels still do; the issues there are somewhat different due to the high loads. -- Typoes are a feature, not a bug. Some gardening required to reply via email. Words processed in a facility that contains nuts.
Not where I go but that might be country/locale dependent. The Tire shop is legally obligated to tighten the wheel to the manufacturers specifications. Smart shops do tell you in writing that alloy wheels should be re-torqued after 200 miles. (FYI, and OT, don't use shops that don't use a torque wrench to tighten your alloy wheel lugs).
You mean there's a tire shop that doesn't tighten lugs with an air impact wrench??
