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My general observations with shims vs Coop45 machined sheave. Hopefully this will help others understand the effects these mods have on their machines before making their decision on what mod is best for them. Results may vary based on numerous variables. Belt and sheave condition greatly influences the final numbers.
Stock
2.45:1 initial CVT ratio
-1mm shim
2.65 to 2.70:1
Aprox 8-10% reduction in initial ratio, around 2.5 mph top speed loss
-1.5mm shim
2.75 to 2.8:1
Aprox 12-14% ratio reduction, around 4 mph top speed loss
-Coop45 sheave, no shim
2.9:1
Aprox 18.5% ratio reduction, equivalent to 2mm of shims but no top speed loss
-Coop45 sheave, with 0.5mm shim
3:1
Aprox 22.5% ratio reduction, equivalent to 2.5mm worth of shims but with only 1.25 mph top speed loss.
Anyone else feel free to post your own results
Stock
2.45:1 initial CVT ratio
-1mm shim
2.65 to 2.70:1
Aprox 8-10% reduction in initial ratio, around 2.5 mph top speed loss
-1.5mm shim
2.75 to 2.8:1
Aprox 12-14% ratio reduction, around 4 mph top speed loss
-Coop45 sheave, no shim
2.9:1
Aprox 18.5% ratio reduction, equivalent to 2mm of shims but no top speed loss
-Coop45 sheave, with 0.5mm shim
3:1
Aprox 22.5% ratio reduction, equivalent to 2.5mm worth of shims but with only 1.25 mph top speed loss.
Anyone else feel free to post your own results