Bikes and Tech: Page 535

Bike and gear reviews, maintenance how-tos, and tips

Written by Josh at Zipp – Supplement to LZ Column

Written by Josh at Zipp:Here is an excerpt from a PM I sent to somebody a few weeks ago on this identical topic. I hope this helps clarify things somewhat... The outer aluminum hoop in our clincher rims weighs only 200 grams, and therefore will get much hotter than a standard aluminum rim. Since the temperature of something is relative to the energy input/mass, a 200 gram rim will get twice as hot as a 400 gram rim for the same energy input. What happens is that if your descending a mountain at 70 degrees and you brake for 2 minutes and your standard aluminum rims heat to 220 degrees (an