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Triumph trials gear ratio's

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I have been asked by a French chum, who is building a Trifield, if I could find out the gear box ratios, and also  the sprocket sizes that people in the UK use. Also once found, who could furnish such items.

Appriciate any help as he hope to ride in Scotland next year, after struggling a little on his big Terrot.

Merci.

I have a 16 tooth engine sprocket and 15 tooth gearbox supplied by D & C Classics

48 teeth on cub rear. using 520 Standard chain. heavy chain catches on the gearbox casing. gear ratios STD.

7 hours ago, beno41 said:

I have a 16 tooth engine sprocket and 15 tooth gearbox supplied by D & C Classics

48 teeth on cub rear. using 520 Standard chain. heavy chain catches on the gearbox casing. gear ratios STD.

Trifield is a twin motor in a Crusader frame so Cub detail not relevant

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