J
Jobst Brandt
Guest
Dave vt? writes:
>> This is for most rims an insignificant load unless there are crack initiators. As I have
>> mentioned, I have ridden MA-2 rims until sidewalls were worn down to 0.5mm (0.020") with no
>> failure.
> These sidewalls are ~1.5-1.8 mm thick at the crack.
> How do you know when to replace a rim? Concavity in the brake wall? Do you measure the wall
> thickness? Based on your earlier post, I don't think you wait until they crack.
I have a calibrated thumb and forefinger that I pass over the rim in a brake caliper manner feeling
the hollow cheeks of the rim. I know how .5mm wall feels. On a tour of the Alps on which it rained
on almost every major descent. I noticed at the top of the Stelvio that I was at the limit on the
front rim. Because it was raining, I could not use the front brake, so I used only the rear brake to
descend. Afterwards, in the flatland, as soon as the road was dry, I could use the front brake
again, because practically no wear occurs when dry with Kool-Stop Salmon red pads because they don't
get grit inclusions. I have a section of that and other rims, in my collection.
Jobst Brandt [email protected]
>> This is for most rims an insignificant load unless there are crack initiators. As I have
>> mentioned, I have ridden MA-2 rims until sidewalls were worn down to 0.5mm (0.020") with no
>> failure.
> These sidewalls are ~1.5-1.8 mm thick at the crack.
> How do you know when to replace a rim? Concavity in the brake wall? Do you measure the wall
> thickness? Based on your earlier post, I don't think you wait until they crack.
I have a calibrated thumb and forefinger that I pass over the rim in a brake caliper manner feeling
the hollow cheeks of the rim. I know how .5mm wall feels. On a tour of the Alps on which it rained
on almost every major descent. I noticed at the top of the Stelvio that I was at the limit on the
front rim. Because it was raining, I could not use the front brake, so I used only the rear brake to
descend. Afterwards, in the flatland, as soon as the road was dry, I could use the front brake
again, because practically no wear occurs when dry with Kool-Stop Salmon red pads because they don't
get grit inclusions. I have a section of that and other rims, in my collection.
Jobst Brandt [email protected]