Senzo OTK Tony Kart EVK 401 401R Chassis Protector Set LMR Kart Store Senzo OTK Castor & Bumper Tool Senzo OTK Tony Kart Special DOT 4 Castor Adjuster Pair Senzo TonyKart OTK Castor Kit Hardwearing Box Go Kart Karting Race Senzo OTK (TonyKart) 50mm Rear Axle KKC Kart Components. To fit M10 king pins. The castor adjusters are available in a number of different options: DOT 1 Provides the least amount of castor DOT 2 Provides increased castor from DOT 1 for improved front end grip DOT 4 More castor than the standard OTK full castor kit. Ideal for wet conditions or low grip tracks where increased front end grip and turn in are required DOT 5 Provides maximum castor angle for very wet conditions where maximum front end grip is needed. Centre (Blank) Gives a castor angle in between standard zero and full castor. Ideal for where more release from rear corner grip is required. View the product focus blog on these kits here.