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  1. #1
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    Please help me understand bike tyre sizing!

    Hey there
    So I just got a new bike, Carrera Subway, and want to find out what size tyres it has to order some new tyres. I want some thinner ones to make it faster on the road.

    However, I'm confused with the sizing - eg what does 700x23 mean?
    Also, how do I measure the size of the tyre?

    http://www.halfords.com/webapp/wcs/s...egoryId_165534

    This is the bike.

    Many thanks!

  2. #2
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    EDIT :

    I just looked at the description, and for my bike it says this : CST hybrid tyres – 26 x 1.9

    Can anyone explain that for me ?

    Also what size tyres would fit my bike. Would these?
    http://www.wiggle.co.uk/schwalbe-city-jet-mtb-tyre/

    Thanks in advance guys

  3. #3
    coprolite fietsbob's Avatar
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    Better to get used to the ETRO numbers on the tire side wall ..
    622-32 or 559-50

    700C is a French Rim-tire size .. in ETRO it's 622mm , Bead seat diameter..
    then the 2nd number is the width 23MM in your case .. a racer bike wire bead equivalent
    of the tires the Pro teams buy that are traditionally Not clinchers ,

    But Tubular, Inner tubes Sewed closed and Glued to a rim.

    26" is 559 BSD. about where the Brake pads hit the rim..

    ETRO - European Tire and Rim Organization
    a standard they agreed upon so tires fit rims though not made in the same company or country..
    Last edited by fietsbob; 01-12-14 at 12:37 PM.

  4. #4
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    For everything you could want to know about tire sizing, take a look at Sheldon Brown's site http://sheldonbrown.com/tire-sizing.html

    For your specific bike, you need a 26"(559) tire, stock the bike has 26x1.9, if you are looking for a faster rolling tire, something like this http://www.wiggle.co.uk/continental-...pid=5360219310 lots of options out there, as long as the tire is a 26"(559) it will fit your rims. Getting faster will require fitness, don't assume that just putting different tires on will make it faster instantly.

    Edit, If you looking at the Schwalbe City Jets, these are cheaper at Halford/Chainreaction cycles, you can also get cashback on these via Quidco/TCB

  5. #5
    coprolite fietsbob's Avatar
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    Slick tires will be easier , more efficient Rolling than Knobby ones ,

    fast is still about pushing into the air resistance.. there , A stiff wind to your back helps.

    want a Race wheel like TdF,? you buy a second Bike , may be more than 200 GBP ..

  6. #6
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    Quote Originally Posted by jimc101 View Post
    For everything you could want to know about tire sizing, take a look at Sheldon Brown's site http://sheldonbrown.com/tire-sizing.html

    For your specific bike, you need a 26"(559) tire, stock the bike has 26x1.9, if you are looking for a faster rolling tire, something like this http://www.wiggle.co.uk/continental-...pid=5360219310 lots of options out there, as long as the tire is a 26"(559) it will fit your rims. Getting faster will require fitness, don't assume that just putting different tires on will make it faster instantly.

    Edit, If you looking at the Schwalbe City Jets, these are cheaper at Halford/Chainreaction cycles, you can also get cashback on these via Quidco/TCB
    Thanks for all the replies guys!
    Much appreciated.

    Hmm, those Conitinental ones don't come in 26"?

    So a quick check, with these (http://www.wiggle.co.uk/schwalbe-city-jet-mtb-tyre/), there are 3 options - will ALL of them fit on my tyres?

    Thanks again

  7. #7
    apocryphal sobriquet J.C. Koto's Avatar
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    Quote Originally Posted by Zoof View Post
    Thanks for all the replies guys!
    Much appreciated.

    Hmm, those Conitinental ones don't come in 26"?

    So a quick check, with these (http://www.wiggle.co.uk/schwalbe-city-jet-mtb-tyre/), there are 3 options - will ALL of them fit on my tyres?

    Thanks again
    Yes, all of them will fit. As long as it's "twenty-six by one-point-something" e.g. 26x1.5 or 26x1.95 it'll fit your rim. It's important to stick with decimal and NOT fractional (e.g. 26x1 3/8 "twenty-six by one-and-three-eighths") since they aren't ideally compatible.
    Last edited by J.C. Koto; 01-12-14 at 02:29 PM.

  8. #8
    Senior Member Retro Grouch's Avatar
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    Quote Originally Posted by Zoof View Post
    I want some thinner ones to make it faster on the road.
    Don't expect skinnier tires to make you more than incrementally faster.
    My greatest fear is all of my kids standing around my coffin and talking about "how sensible" dad was.

  9. #9
    Senior Member BlazingPedals's Avatar
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    You don't need to go all the way to 25mm. For mountain bike purposes, I'd call anything 37mm and narrower to be 'narrow." Here's a few more possibilities.

    http://www.wiggle.co.uk/continental-...rix-road-tyre/ comes in 25mm
    http://www.wiggle.co.uk/continental-...city-mtb-tyre/ comes in 28mm
    http://www.wiggle.co.uk/schwalbe-mar...acer-mtb-tyre/ comes in 32mm
    http://www.wiggle.co.uk/schwalbe-koj...igid-mtb-tyre/ comes in 37mm
    Plus, if you can find them, Primo Racers come in 25 or 32mm widths.

  10. #10
    Senior Member Homebrew01's Avatar
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    If you go from large diameter tires to skinny ones, you will also need skinny tubes. If you make a minor change in diameter, then the existing tubes should be ok.

    Trying to fit fat tubes into a skinny tire means likely folding the tube, and possible problems getting the tire to seat correctly because of the extra tube material in the way.
    Bikes: Old steel race bikes, old Cannondale race bikes, less old Cannondale race bike, crappy old mtn bike

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