handles fit very well. We installed them for about a month. We didn't need soap and/or water to put them on. It only took a few minutes and a little effort to process them. They appear to be quite durable, but only time will tell. My son says he prefers the ergonomic design to the standard. We haven't had any problems turning the cranks yet. I will update the rating if this problem occurs. Be sure to measure the required grip length for each side of the handlebar before purchasing. Our bike has a derailleur on both sides, so we needed two short (90mm) knobs. Some grip sets come with a shorter and a longer grip. Overall, I can recommend these cranks and will probably buy them again for our other children's bike.
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