BetaMotorcycles.netThe Beta RR 4T Enduro information source
With the Sachs linkage rear shock, 6-speed KTM motor and Marzocchi forks, the Beta RR 4T makes an excellent supermoto machine. Unfortunately, parts can be hard to come by. at this time, there doesn't appear to be a ready-made 17" wheel solution other than the one offered by Beta themselves. Most other parts, however, are available from the aftermarket.
Other than 17" rims and tires, bigger brakes are the best investment you can make in your new supermoto bike. Although the Beta's stock 260mm Braking rotor is good, it still doesn't have the feel and power needed on the asphalt under race conditions. The 320mm Braking front rotor (part # SK087L) is a good start, and a caliper relocation bracket from a 2004-20099 Kawasaki KXF450 will fit the Beta forks. To really get the stopping power and feel you want at the end of those long straights, an aftermarket caliper is highly recommended.
Epic Motorsports in Longmont, CO is the place to go for Beta supermoto brake solutions. They can set you up with a ready-to-go Brembo 4-piston caliper solution that is the best available on the market today. The caliper is specially machined by Epic for spoke clearance and all of the parts have been test-fitted on a 2005 Beta 525 RR4T. The prices are significantly better than Motostrano, and the service can't be beat.
Images removed. Files were copyright Michael Hill and watermarked, but Mr. Hill has a very strict Do Not Use policy and it's unclear if anybody posting his images anywhere would result in vindictive behavior instead of a takedown request.
Beta 525 RR 4T on the Track (IMI in Denver, CO):