Underground Manufacturing 2-Hole 316 Stainless Steel Simple Replacement Spool

Stainless steel replacement spools/pulleys for the venerable Petzl Simple descender. These 2-hole spools replace the upper position spools of older Simples (pre 2019). Though we feel an aluminum spool is a better choice for the upper position in terms of weight, cost, and balanced friction, we do offer these for those that desire them. Made of 316 stainless steel, these replacement spools last 6-10x as long as the stock 6061 Aluminum spools. They offer reduced friction and a much smoother ride. We recommend replacing only the bottom spool, which sees the most wear—replacing both is unnecessary. Each spool weighs approximately 147g (5.2oz). We also make 7075 Aluminum (light weight, but more durable than stock by about 2x) in both 1-Hole and 2-Hole versions.

316 stainless isn’t cheap as a raw material and is is somewhat difficult to machine requiring extra time and more costly tooling than aluminum. The stock 6061 spools are cheap at around $15-25 (if you can find them) but our stainless spools last so much longer that they end up being significantly cheaper than the number of aluminum spools you would use in the same timeframe. It depends on your use case of course, but most people should expect to get many years of regular use from just one! For some, it will be the last replacement spool they ever need to purchase. These spools are in use all over the world and hand made in the USA. The 2-Hole versions are more time consuming to manufacture due to the off center mounting holes, and thus cost a bit more than the 1-Hole versions.

It is, of course, your responsibility to familiarize yourself with your new spool(s) (and any other changes to your vertical setup) in a controlled setting prior to real world use. Replicate all conceivable scenarios you might encounter. Make sure your setup works to your satisfaction, your life depends on it! If you aren’t happy with the performance of your spool(s) after this step, you may return them.

All spools are tested for fit and function prior to shipping, please excuse any resulting minor cosmetic imperfections that may result. Serial numbers may be laser engraved or stamped.