Bike tyres / inner tubes

edited 30 November -1 at 1:00AM in Public Transport & Cycling
8 replies 1.3K views
samsung_laptopsamsung_laptop Forumite
301 Posts
edited 30 November -1 at 1:00AM in Public Transport & Cycling
I'm looking to buy a inner tube and tyre for my daughters mountain bike so if the tyre that's on the bike says (54-406) 20 x 1.95 can I replace it with a (50-406) 20 x 1.95 tyre. The inner tube I removed says 20 x 1.75/190/1.95 so can I replace it with a 20 x 1.75-2.125.

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  • edited 7 January 2018 at 9:48PM
    pinkladyvenuspinkladyvenus Forumite
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    edited 7 January 2018 at 9:48PM
    I would say yes to both questions. You are replacing like for like with the size of the tyre (20x 1.95) the 20 refers to the size of the wheel and the 1.95 is the tyre width both measurements are in inches.

    The inner tube you are looking to replace the original with fits tyres ranging from 20 x 1.75 to 2.125. (20 been the tyre size and 1.75 to 2.125 the tyre width again both in inches. A bit like a pair of socks that says fits size 5-8
    Sealed pot challenge member 437
  • I would say yes to both questions. You are replacing like for like with the size of the tyre (20x 1.95) the 20 refers to the size of the wheel and the 1.95 is the tyre width both measurements are in inches.

    The inner tube you are looking to replace the original with fits tyres ranging from 20 x 1.75 to 2.125. (20 been the tyre size and 1.75 to 2.125 the tyre width again both in inches. A bit like a pair of socks that says fits size 5-8
    Would you know what it means by the numbers (54-406) or (50-406). It's a lot different to years ago when you just went and bought a 20 x 1.95 inner tube.
  • pinkladyvenuspinkladyvenus Forumite
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    54 to 406 and 50 to 406 is the metric measurements of the tyre and its width. To be honest I always ignore these and stick to the inch measurements as it is easier when replacing tubes and tyres.
    Sealed pot challenge member 437
  • elversonelverson Forumite
    808 Posts
    If you're not sure, just pop into your local bike shop and they can double check for you.
  • elverson wrote: »
    If you're not sure, just pop into your local bike shop and they can double check for you.
    We don't have any bike shops around me. We do have an Halfords about 3 miles away but would you trust them.
  • elversonelverson Forumite
    808 Posts
    For everyday tyres and tubes, nothing wrong with Halfords/Evans etc. I wouldn't take a vintage racer into Halford for a full strip down and rebuild though.
  • Nebulous2Nebulous2 Forumite
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    Would you know what it means by the numbers (54-406) or (50-406). It's a lot different to years ago when you just went and bought a 20 x 1.95 inner tube.

    You're going to wish you'd never asked!

    Sheldon Brown was a great source of knowledge on all things bicycle related. He died some time ago, and some of his stuff is dated, though I think there have been some attempts to keep it up to date. He is still about as good as you will ever need on tyre sizes however.
  • 54 to 406 and 50 to 406 is the metric measurements of the tyre and its width. To be honest I always ignore these and stick to the inch measurements as it is easier when replacing tubes and tyres.
    I asked a bike shop and they said 54-406 is usually 2.125 width tyre but it depends on manufacturer
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