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Triton racer gearing and more.

Discussion in 'Triton' started by Lanks, Feb 19, 2020.

  1. Lanks


    Nov 1, 2014
    So I’ve been sorting out an old racer it’s interesting running Grayson cases and about 830cc. I’ve got a 5 speed triumph cluster in a box and could do with some advice on the gearing. I’ll be running a triumph conical rear which I think the lowest I can go down to on the sprocket is 46/45?
    I will ride it on the road but want it good for the track. I’m thinking a 22 engine sprocket (Norton crank) 21 gearbox sprocket (cant find a 22 but), standard clutch basket and then go up a bit on the back wheel. Which would then give me easy up or down fine changes?

    Has anyone ran a similar set up and can advise me please?

    Also thinking of running 2 34mm Mk2 concentrics (have a set of 30’s) any tips on jets would be great.

  2. Matt Spencer

    Matt Spencer

    Jul 25, 2010
    1 , 2 , miss a few . 99 , 100 .

    Thats a lot of fancy numbers !

    The Pre Unit , single row , a 25 T was a option .

    Id gear it for 100 - 110 in third. 140 at redline minimum .
    depends if its a tourquer or a rever , as to teeth .

    Wots yer inteded RED LINE . 7.200 was Std. knorton , seeing thats the crank .
    A triumph will rev a mite past that .

    32 carbs'd likely be adequate . the olde 1 5/32 or 1 3/16th . Unless your runing methanol .
    Av Gas might liven it up . alow more juice & spark .

    I suppose its even got mufflers .

    I.o.M. 650 ran 145 + . so a tad past mightnt hurt . If the wheels are bolted on tight .
  3. Chris

    Chris VIP MEMBER

    Jan 21, 2008
    Hi Lanks
    Stacey Kilworth ran this set up with BHR & CRMC for many years. Fast bike fast rider. He is on facebook.
    Also Fast Eddie on these pages ran a big 8 valve T140. He might be able to point you in the right direction.
  4. Matt Spencer

    Matt Spencer

    Jul 25, 2010
    Just saw you other querie . Inane speculations await , there .

    Need to see some pictures of the machine .

    Setting up so you present minimal frontal area , tucked in comfortably , is important , up past ' the Ton ' .
  5. acotrel


    Jun 30, 2012
    Your gearing depends on the circuit and whether your motor is built to deliver top end power or built to deliver torque. Triumph motors last much longer and go faster if they are built to pull hard rather than gain power by increasing the revs. (do not over-port the cylinder head). If your motor is built to pull, you will not know how fast your bike will go until you raise the overall gearing, but in saying that, you need close ratio gears to get maximum acceleration up through the gears. The close 5 speed Triumph box is pretty good, but there are two pairs of gears available which move 2nd and 3rd gears closer together and up towards 4th. For a small circuit, I would start by running a 24 tooth engine sprocket, 18 tooth on the countershaft, and 38 on the back. But what you use on public roads will probably need to be very different to what you use on the track.

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