The tooth form is the Uniroyal / Gates High Torque Drive (HTD) developed originally in the late 1970s and , according to the people I consult in the belt industry, the most suitable for our usage where torque, tension and belt speed fluctuations occur all the time. Also the HTD tooth form being deeper than the trapezoidal tooth form belts used by some belt system makers is far less liable to ratcheting (jumping pulley teeth).
I believe Mr newby employs the GT3 version of the HTD belt as it has much higher power ratings than the original HTD or later GT2 versions. Personally if I still rode motor cycles I would always fit a DRY running primary drive belt system simply because I can then obtain a correctly working clutch that possesses all the qualities a clutch is suppossed to possess. I.E. it will......
1 NOT slip when fully engaged even when hot.
2 free off INSTANTLY and without drag whenever required even when hot.
3 be EASILY operated by the uses at all times.(2 fingers MAX)
4 possess the LIGHTEST rotating weight reasonably possible. Not that anyone at Norton BSA or Triumph in their later days remembered this!!
Please remember that ALL the belts we employ were DESIGNED to be employed DRY and were NOT designed to be employed with oil and that any form of lubrication between a belt and pulley significantly increases the risk of ratcheting occurring.
Suggest everyone remembers when deciding to buy a belt system the comment made in a Supercycle magazine regarding some USA belt system makers at the time...unfortunately it has also applied for many years to some UK belt system manufacturers and dealers. ( I do NOTinclude Mr Newby among them)
‘Unfortunately in the motor cycle belt world the makers have fairly muddied the waters as far as the consumer is concerned. They have laid out claims they know to be false, always exaggerated and they engage in an inordinate amount of competition ridicule. All this is done to justify and promote the belt each maker can easily obtain.’
(Super Cycle Magazine 1977 and it very probably applies just as much these days).