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If the rands on your shoes have worn down to the point where you can see the synthetic material of the shoes, then you definitely need to replace your rands. Sometimes there are no visible holes in the rand, but there may be other physical evidence that the rand is thinning. It may not be absolutely necessary to replace the rand, but it is highly recommended. The company will only recommend repairs that the company did on their own shoes if the company recommends a rand replacement. It is usually best to replace both ring gears at the same time to prevent uneven wear. Yosemite Bum will default to replacing the rand on both shoes if you blow through a rand.
The first step in the Primer-A process is to remove the outsole from the shoe. Depending on the wear and the shoe construction and previous sole, Yosemite Bum will replace half of the outsole or the entire outsole. Complete outsole replacements are less common, but if a shoe has been resoled before and neglect to do so would compromise the shoe's construction or fit, the company will replace the complete outsole.
Yosemite Bum does its best to maintain the fit and fit of the shoes when the company resoles. Slight variations may occur due to the nature of sole-processing a shoe, which involves stripping some parts that may be integral to the shoe's construction. The process is pretty much the same for all resolvers, but the company always resolves your shoes on the last (shoe mold) to ensure the fit is as close to perfect as possible.
Please contact the company and they will be happy to inspect your shoes and determine if repairs are required if you experience any issues that are out of normal wear. Yosemite Bum has a very high client satisfaction rate due to the legendary service and the company will do its best to make favorable mediations. Take care of your shoes and have reasonable expectations of what might happen since climbing is built on mutual trust.