Not suitable for Shimano mf-tz21. There are many cartridge removal tools out there and it's easy to get it wrong. The tool is well made and will likely work well with the Shimano cassettes it was designed for. The only difference I could understand was that it has spikes that are about 0.4mm longer than my bike. I filed the spines of the books to remind myself to be careful when filing. That gave me time to think about what mf means. If you're ever in my predicament, filing the spikes down a bit will work. However, I would recommend buying the right tool.
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