Owner's Review Stark Varg - First Customer Review!

[fsfs]

You seem like the person to ask... Can you help me understand the claimed torque specs for a Stark Varg?
In my mechanical world, Horsepower is calculated by multiplying torque x RPM and dividing by 5252. So for the Varg - 665 lb-ft x 14200rpm / 5252 = 1797 horsepower.
Clearly that cannot be right, so what am I missing?

The marketing material quotes rear wheel torque which is subject to gearing ratios. The motor itself has a peak torque of about 80Nm. It can deliver this torque from 0 RPM to about 7000RPM. From 7000RPM to 13000RPM the torque will gradually drop from 80NM to 45Nm. These are just rough numbers from memory, but they should give you an idea of how the system behaves. IIRC, the gear reduction from the motor shaft to the counter shaft is 3.5:1 and then whatever sprocket ratio to the rear wheel.

 

[Philip]

Thank you, @fsfs, this is perfect.

Could someone please count the number of teeth in the Varg's primary gear reduction?

 

[Chewy]

Surely I don't have the same expertise but I think I can answer: 665 lb-ft is the peak torque at the wheel, which doesn't spin at 14,200 rpm: the motor shaft does. Besides, tipycally motors can't reach the peak torque at maximum rpm.

Oh rear wheel torque... that was the part i was missing.
Although it does say rear wheel torque in the write-up, It's written in the same sentence as though it's an engine rating. Where rear wheel torque obviously is different depending on the sprocket sizes used. Write-ups on other bikes don't seem to conflate the two in the same way. But thank you, I get it now.