BTX 153

[uofm]

Could anybody tell me what the gearing will be in this compared to the XTX 141 or XTX 137?

 

[veemaks]

CR gave the info in his blog. Basically it will be the same gearing if you're not getting the XTX LE with 2.25 Power claw.

"RTX and LTX 129 / 137 inch track, XTX and BTX 141 x 1.6 /153 x 1.75 all use 9T drivers with 21/41 gear ratios. XTX and BTX x 2.25 Power Claw uses 8 tooth drivers with 24/50 cogs and the MTX uses 7 tooth driver with 21/49 gears.
I’ll save you the math and give theoretical tops speeds for these ratio formulas: 21/41 9T = 120mph / 24/50 8T = 105mph and 21/49 7T = 82mph."

 

[WVTurboLTX]

CR gave the info in his blog. Basically it will be the same gearing if you're not getting the XTX LE with 2.25 Power claw.

"RTX and LTX 129 / 137 inch track, XTX and BTX 141 x 1.6 /153 x 1.75 all use 9T drivers with 21/41 gear ratios. XTX and BTX x 2.25 Power Claw uses 8 tooth drivers with 24/50 cogs and the MTX uses 7 tooth driver with 21/49 gears.
I’ll save you the math and give theoretical tops speeds for these ratio formulas: 21/41 9T = 120mph / 24/50 8T = 105mph and 21/49 7T = 82mph."

But then he gives the over drive ratio of .91. That would make the top speeds at full shift 131, 115 and 90.

 

[NOS-PRO]

I would think the XTX with the 1.6 lug 3.0 pitch track would be 8 tooth drivers like what I have now.

 

[ROCKERDAN]

But then he gives the over drive ratio of .91. That would make the top speeds at full shift 131, 115 and 90.

at what rpm? Im coming up with less then 131 for rtx at .91OD.

Dan

 

[WVTurboLTX]

at what rpm? Im coming up with less then 131 for rtx at .91OD.

Dan

I was just dividing the speeds given by .91. CR says they've been seeing mid 120s in testing

 

[WVTurboLTX]

Running the numbers at .91 and 8800 rpm is 120 and some change. Must be shifting out more than they expected.

 

[DC5]

Running the numbers at .91 and 8800 rpm is 120 and some change. Must be shifting out more than they expected.

Or running more rpm, at 9100 it is good for 125mph