Does anyone know if a speedo drive off a GS500 or GS450 would work on my DRZ with the 17" rim? The speedo drive for the 21" front obviously isn't working as it says I'm going approx 40mpg when I'm actually doing about 25 mph or so. I'd really like to find a speedo drive that will give me more accurate mph and mileage. If not a GS drive, any other suggestions? Thx!!