I know the street rod is different than the vrsca. But I don't know what is different? Do you know your drive ratios on the pulleys?
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2003 and 2004 V-Rods came with 72 tooth rear pulleys and 30 tooth front pulleys. From 2005 onward, US and Canadian market bikes including the Street Rod came with 28 T front pulleys while the rest of the world continued, and continues, to get bikes with a 30 T front pulley.
Street Rods have a unique frame that has a taller seat (if you look at the triangulated section of the frame behind the engine you can see the difference between the Street Rod frame and that of other V-Rods). The R was the first V-Rod to come with a 5 gallon fuel tank. It sits taller because it has longer rear shocks, more suspension travel and has less rake. The R has a different exhaust that was shared with the D (Night Rod) so both bikes could use mid set rider pegs. The A/B/SE/X/AW exhaust interferes with mid mounted rider pegs. The R, because it sits higher, has a unique side stand. The R and the D received unique to them ten spoke cast wheels that use a 180 rear tire. Because they use a 180 rear tire they came with the wider 1 3/8 inch drive belt. Bikes with 240 rear tires (2007 and later) have narrower 1 inch belts. The 2006 VRSCE had an even narrower 7/8 inch wide belt because Harley stuffed a 240 rear tire into the original frame with a narrow rear section and swingarm intended for a 180 rear tire. Something had to give, and a super narrow belt was it. Since they are now carbon fiber instead of Kevlar, strength is not a problem.
On my R with XR-1200 wheels, fitting a pulley to the rear, getting the gearing sorted out with a smaller diameter rear wheel, finding a pulley that fit that rear wheel and then finding a belt that would work was quite an engineering project. I ended up with a Japan market rubber isolated 68 T rear pulley (used on Japanese market Sportsters and, I later found out, sold as a replacement for the solid mounted rear pulleys on 2007 and 2008 baggers to cure a vibe in the early 6-speed Cruise Drive drive-line), a 30 T front pulley and since I now needed a belt with 147 or 148 teeth I ended up having to use a 147 T belt from Victory and have it cut down from 28 mm to 1 inch to fit the rear pulley I was using. Of course we needed to space the rear rotor and pulley out from the Sportster wheel to get everything to line up, and Drag Specialties had the right thickness spacer discs (whew!). We made custom axle spacers out of lengths of fork tube from a mini-motocrosser! Amazingly this Frankenstein monster has proved to be completely trouble free in use. With a 17 inch rear wheel, 68 T rear pulley and 30 T front pulley, the overall gearing is very slightly taller than a stock V-Rod with a 30 T front pulley. There is maybe a 3 mph increase in top speed at red line, like I can use that very often. It is a comfortable bike for chasing horizons.