This is a larger 7/8" (0.875") diameter bore rear wheel cylinders for your TR250 and TR6.  TR250s through 1969 TR6s use a 0.75" bore RWC as standard, 1970-1976 TR6s use a 0.70" bore RWC as standard.  The bore diameter, in addition to the brake line fluid pressure, determines the effective force applied to the brake shoes.  The larger the bore diameter, the more force produced given equal line pressures before and after.

We strongly recommend that the these cylinders are paired with go Carbon Kevlar based brake shoes.  We stock brand new Carbon Kevlar brake shoes for street use and race use.