Speed Calculations?

[Finnster]

The gearing is a bit low on your XLs. For a 8XL, a 16.3:1 FDR is about perfect on my Revo. I can tell you from radar testing that an 8Xl in a MT will do ~41 mph properly geared w/ good cells. The 6.5 is quite a bit slower, but eh 4.5 may be a bit faster, but is tempermental to gearing and will fry otherwise. I would think a 9XL should be 38-40mph realistically.