The Street Rod sports two 300mm discs on the front wheel and one on the rear wheel, each of them is bitten by a two-piston caliper. The performance of this setup is quite impressive and much Specifications. Royal Enfield Continental GT 650. Harley-Davidson Street Rod. Engine. 648cc parallel-twin air-cooled engine with oil cooler. 749cc liquid-cooled, High-output Revolution-X V-twin 212 posts · Joined 2005. #1 · Mar 15, 2005. Sportster 1200R vs VRSCR Street Rod. I am considering these two bikes, new, if anyone has some words of wisdom or experience comparing these two, I would appreciate hearing them. I’ve ridden a 1200 R and a VRod VRSCA model, but not yet a VRSCR, which I strongly prefer to the A or B model. uvcuj43.