It can be hard to find a chock that has decent compatibility with the generally wider tire that sportsbikes use – unless you want to splash out on expensive trackday stuff. The Extreme Max is a little bit more expensive than other products at the budget end of the spectrum, but it fits 17 and 21-inch wheels, including sportsbike-style wheels. I think for a $75 or so product, that’s pretty good.
In practice, owners of this chock have put a lot of faith in the product and it seems to be justified. It’s holds the bike solidly and performs well even with a bit of rough terrain.
As with many of these chocks you need to mount it to something as it won’t hold a bike up reliably just standing free out of the box. You should also be warned that the bolts that are included with this product seems to be a weak point, so perhaps replace them straight away with heavy duty versions. They won’t cost much and should give you more peace of mind.
Some sportbike owners also say that the chock is too wide for anything but a 180 or 190 section tire, so keep that in mind.
The chock itself, however, seems to be a good quality item that performs as expected. As long as you are confident that your particular bike will fit and you buy those uprated bolts, this could be a real bargain.