Bodging My Way Through Building A Triton: The Frame Enjoys A Nice Cup Of Tea And A Sit Down With Motor And Gearbox

Saturday, September 1, 2007

The Frame Enjoys A Nice Cup Of Tea And A Sit Down With Motor And Gearbox

The engine and gearbox were finally introduced to the frame today. Impatience got the better of me, and while the frame still needs to be sent off to be checked for trueness, I thought it would be fun to have a little assembly time! Still a lot missing, but at least it looks like something now.

A quick cup of tea while I admire my work, take some pictures, and then dismantle it again to get the frame ready to send off.

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Smiths Chronometric Speedo Fitment

The calculation for determining the speedo series number is
1680 x A/B, where
A is the number of turns of the speedo cable for six turns of the rear wheel;
B is the radius of the rear tire in inches;
1680 is a constant.

Find the drive ratio as described in my post above. Let's say it's 2:1. Let's also say the tire radius is 13.1 inches. The calculation then is 1680 x 6 revs x 2(drive ratio) divided by 13.1 inches equals 1538.9. This number is within 10% of 1600, so in this case a 1600 series speedometer head is required. (A 15 to 12 drive will alter the number to 962, in which case a 1000 series speedo is required.)

This gets you to within 10% which is the adjustment range of a Smiths unit. The final tweaking can be done internally by a specialist. Or the unit might be spot-on, as is.