Need lower gearing, but which gears ??

Thanks Jerry, my rear wheel is quick release, very short axles and no room for spacers as is.

Wouldn't the 10t produce a higher rpm with my current setup compared to the 17t ??
 
Just the opposite. Engine rpm 7000÷18.75=373.33... (373.33...x 10/44= 84.84... cadence.) (373.33...x 17/44=144.24... cadence.) (373.33... x 15/44=127.27... cadence.)
 
Since you can't move your rear wheel over go with the 17t on your gearbox. You just won't have an overdrive gear. You won't be able to shift into 7.
 
Low end means you gain torque but lose speed. A small gear on your gearbox means you can climb really steep hills or pull really heavy loads. A large gear means you'll go faster but may have to assist going up a hill. With a 17t gear on the gearbox the only way you'll need to assist while in 1(1) is if you're pulling a heavy load behind you. Here is what you'll have with that set up 7000÷18.75×(17:44)×(42:16)×(13÷168)~29.3 mph. Would be your top level ground speed. If you're going downhill let off the gas after 29.3 mph. You'll just be over reving after that. With a 10t gear this is what you'd have. 7000÷18.75×(10:44)×(42:16)×(13÷168)~17.2 mph.
 
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