Has anyone tried these yet? There's a ton of grass around here..The bearings get messed up lots of times.
http://www.racecap.it/
https://www.youtube.com/watch?list=UUIb ... lb-EDsgxso
https://www.youtube.com/watch?list=UUIb ... lb-EDsgxso
http://www.ebay.com/itm/RACECAP-PROTEZI ... 650?_ul=AR