Grinnall Rocket 3 Tyre Pressure

Discussion in 'Tyres' started by David Cooper, Jul 1, 2018.

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  1. David Cooper

    David Cooper Triumph Rocketeer.
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    Anybody know what the tyre pressures are on a Grinnall Rocket 3 trike, I tried phoning Grinnall but couldn't get through, I googled it with no results.
     
  2. dilligaf

    dilligaf Guest

    Is their an owner group/forum that might be able to help :confused:
     
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  3. David Cooper

    David Cooper Triumph Rocketeer.
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    I tried the Trike forums with no luck, guess I'll just have to try and ring grinnalls till I can get through.
     
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  4. Callumity

    Callumity Elite Member

    Feb 25, 2017
    3,358
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    Nr Biggar
    I am no expert but something like 30 front 15 rear should get you in the ballpark and you then adjust to suit your own preferences.

    I know from building kit cars you need to recalibrate ‘normality’ for tyres designed to carry heavier loads with stiff or no suspension. The front needs to be harder to hold its shape, the rears soft enough to allow flex in the tyre wall.
     
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  5. Callumity

    Callumity Elite Member

    Feb 25, 2017
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  6. David Cooper

    David Cooper Triumph Rocketeer.
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  7. David Cooper

    David Cooper Triumph Rocketeer.
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    Hi
    I went from Kirkby Stephen over to Hawes on Sunday, with the pressures Callumity gave me from Trikedoctor, it seems ok but going round those tight windy roads is very hard work on your arms, I still enjoyed it.
     
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  8. dilligaf

    dilligaf Guest

    Here you go :p 6F25370D-EB48-4B62-BBC9-66B5E6E6E4B7.png
     
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  9. Callumity

    Callumity Elite Member

    Feb 25, 2017
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    Nr Biggar
    Go up a few psi on the front. It will be cheaper than a Bullworker, much less time consuming, and you won’t need new shirts.
     
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  10. David Cooper

    David Cooper Triumph Rocketeer.
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    I had one of those years ago, ended up chinning myself with it and threw it away.
     
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  11. David Cooper

    David Cooper Triumph Rocketeer.
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    #11 David Cooper, Jul 3, 2018
    Last edited: Jul 4, 2018
    It has a steering damper and, I had to copy and paste this,
    Front Suspension: 43mm upside down forks.

    Rear Suspension: Grinnall CNC billet alloy uprights. Rose jointed unequal length double wishbones in oval tubing. Inboard concentric coil springs and adjustable oil dampers. Inboard anti-roll bar. Adjustable tracking,
    I was given a bit of advice from a bloke with a sidecar combo, he said speed up as you go into a bend to change the centre of gravity, then slow down as you come out, does that sound right?.
     
  12. David Cooper

    David Cooper Triumph Rocketeer.
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    I'm going round the corners with ease now, all I needed to do was grow a bigger set of b***s
     
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  13. Robin Hewitt

    Robin Hewitt New Member

    Oct 7, 2018
    2
    3
    Loughborough
    18psi rear
     
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  14. David Cooper

    David Cooper Triumph Rocketeer.
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    I've found 22 psi works ok on the rear and 30 psi on the front, thanks.
     
  15. Robin Hewitt

    Robin Hewitt New Member

    Oct 7, 2018
    2
    3
    Loughborough
    That's good - I had this info from Mark Grinnall when I first got my R3T
     
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  16. David Cooper

    David Cooper Triumph Rocketeer.
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  17. David Cooper

    David Cooper Triumph Rocketeer.
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    I'll try those pressures mate, to see if it makes a difference, I've tried contacting Grinnalls but got no replies at all. Cheers.
     
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