Wednesday, June 10, 2015

Kishmar's 400 ATC fork

I spent some time making an insert that fits snug in this one. My one piece steerers are 3mm thick where this one is 2mm (plus the 1.2mm thick insert). This may sound overkill, but this is a fork that can fit a 26" wheel, so it needs to be tougher than a 20" BMX steerer. A mistake that I have seen on other's fork designs is to use a thin steerer with a short insert that ends about halfway in the steerer. The problem with this is that the actual bending force occurs over the entire midsection of the steerer, not just that lower 1/4 section. Case in point, a 1.5mm thick steerer plus a 3" insert:

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