Is Bias To Radial Tire Swap Safe?

Discussion in 'Bonneville' started by LeezRyd, May 10, 2021.

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  1. LeezRyd

    LeezRyd Noble Member

    Nov 16, 2019
    Left side of the pond
    I've noticed that riding my '19 T100, it hates the tarred "road snakes" and the painted road stripes. It likes to slide on them instead of ride over them, especially on hot days. I've read that the OEM Pirelli"s are probably the cause. My question is, will replacing a bias ply front tire with a radial design negatively affect the bike's handling to the point of being unsafe? I know putting a tube inside a radial tire changes its' speed rating, but I'm long past the need for speed (74 yrs. old). Also, it's considerably easier finding the correct size tire in a radial than a bias tire. Has anyone made this change and noticed a good result? Thanks
    • Like Like x 1
  2. bruce johnston

    bruce johnston New Member

    May 6, 2021
    Manchester, CT, USA
    I did this with my '78 Yamaha 650 (bias to radial swap), and nothing but good results to report. It was a relief to have modern tread design/compounds on the old bike when I was riding it in the late '90s-early 2000s.

    I don't have a more recent experience, as I have always gotten bikes with radial tires as standard since then.
    • Like Like x 1
  3. alfie

    alfie Getting older but still going for it

    Jan 27, 2018
    Bath, Zumerset
    Plus 1 for BJ. Changed my Street Twin to Continental radius tyres and it now handles as it should.

  4. Steve T.

    Steve T. Active Member

    Dec 6, 2020
    Northern British Columbia
    2020 T120 Bonnie - Just changed from OE Pirellis to Avon Spirits i.e. tubeless radial tires with tubes. Had them waiting in the garage but had a flat rear so swapped them both. I know others have given many negative comments on the OE tires - after about 4k kms I now generally agree with them! All my new bikes over the last few years have improved after getting rid of the OE tires.

    The flat was caused by a skinny looking staple that pushed through the centre tread (not the gap) and must have been sufficient to "tickle" a hole in the tube. When I had the old tire off you could feel there wasn't much meat left at the centre tread and was very thin carcass....
    • Like Like x 1
  5. LeezRyd

    LeezRyd Noble Member

    Nov 16, 2019
    Left side of the pond
    Thanks for your responses, Gents. Looks like my OEM Pirelli's will soon be "take-off's"
  6. SPC1

    SPC1 Well-Known Member

    Mar 16, 2019
    No problem with a radial front, I have Avon Spirits on my T120. They are a massive improvement, Triumph should fit them as standard.
  7. Brixton Steve

    Brixton Steve Member

    Sep 21, 2019
    Yep, same as above. Avon Spirits working a treat on my T120. Especially like them in the rain, which we get lots of.

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