Park Tool

I have used Park Tools' GSC-1 Gearclean brush for years, and it does a good job on chains, chainrings and cassettes. The GSC-4 is more specific to the cassette - it's wider, and the bristles are angled and contoured for that single purpose, so it's more efficient for that purpose.

I did have to figure out the best way to use it. The angle makes it "one-way" (hold in your right hand while standing behind the wheel). If the wheel is off the bike, it will only work on the push. On the pull, the cassette will simply spin. And I do prefer to use it with the wheel off, since otherwise the chain is in the way. Bottom line - if your cassette is dirty, this brush together with the right cleaner/degreaser will quickly get it clean.

I had high expectations of the Park Ratcheting Torque Wrench, and was disappointed to find it didn't meet my expectations. The overall quality wasn't high. There were stickers applied to the stem to depict conversions, and were starting to peel off. The torque readout was difficult to see. I had to really look carefully to adjust the setting to the needed torque. The worst part was the notification that it gave that the torque setting had been reached. Rather than giving a satisfying click, the ratchet head merely pivots slightly. At lower torque settings, this is nearly imperceptible.

I bought this to install my Campagnolo centerlock disc brakes lock rings. Although the tool fit the outside tooth pattern, the inner diameter of the lock ring did not fit my hubs. Thought about returning the tool, and BikeTiresDirect was ultra helpful providing a return authorization and return label. However, the tool fits my Campagnolo bottom bracket cups. So I decided to keep it!

And that blue Park Tool color? freakin' awesome!

I bought this professional wrench thinking it would fit any of the basic pedals I own. Specifically, Shimano DA and SPD pedals which seems to be a very popular and top selling pedal. This wrench fits none of them and am left wondering what pedals this $40 wrench is intended to be used on....flats? Anyway, not the fault of the product but I wish Park and others would list which products these tools are intended for. The Park site provides zero details on use cases other than stating it is for Professional use ??

Giving it 3 stars because it seems well made. Back to using allen wrenches