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  1. #1
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    Does a 700c (622mm) tire fit on a 630mm rim?

    Hello everyone

    I recently purchased an older (probably 70's or early 80's) road bike with a CILO frame and a Shimano 600 system. The rear wheel seems to have bursted and i am trying to fix it myself. I removed the rear tire as well as the tube. The only indication i found was "63 Made in France" on the tube/tire and "Mavic" on the rim. Judging by the list of tires on sheldon brown's website i am guessing that i must have a 27", 630mm rim. Now since these aren't around as much anymore i was wondering if anybody has experience with putting on a slightly smaller 700c or 622mm on a 630mm frame and whether this is a good idea or not....
    Thanks for the replys.

    AK

  2. #2
    Senior Member Shimagnolo's Avatar
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  3. #3
    Older than dirt CCrew's Avatar
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    700cc will fit on a 27" frame as long as you have the 700c wheels and 4mm left to move the brake pads down to match the smaller rim. Many do have this capability, some don't.

    That said, what's the rear dropout width? Many older bikes aren't the 130mm that the newer 700c wheels are. As you can see, it has the potential to be a can of worms...

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    Senior Member cman's Avatar
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    Should be okay. The only thing you may not have is enough brake reach. Dropout spacing should not be an issue on a steel frame.

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    I've heard of somebody managing to do it, with some serious struggling, but it is absolutely not a good idea.

    That being said, 27" (630) tires are widely available, but there might not be as great a selection as for 700c tires, especially in the narrower widths.

  6. #6
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    Quote Originally Posted by cycle_maven View Post
    That being said, 27" (630) tires are widely available, but there might not be as great a selection as for 700c tires, especially in the narrower widths.
    Too true. Since you can still buy decent wheels in the 27" size, as well as a variety of different tires, there's not much of a reason to switch to 700c unless you need really high performance wheels/tires. As far as trying to put 700c tires on a 27" rim, I can't say that I've ever tried it, but I can definitely say that I wouldn't want to...especially since my LBS carries a great selection of 27" tires.

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    Senior Member DannoXYZ's Avatar
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    I've managed to mount 700c tyres onto 27" rims a customer brought in one time. He said he spent quite a lot of money on the tyres through mail-order and didn't want to send them back to switch for the proper size tyres. So I loaned him some 18" motorcycle tyre-levers to mount the tyres. He managed to force the 1st tyre on, but it was completely distorted and the sidewalls were wrinkled and squeezed down between the rim-edges. On the 2nd wheel, he managed to bend and bow out the rim-edges enough that it cracked the rim.

    I told him I'd be more than happy to sell him a set of 700c wheels to go with his new tyres...

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    Quote Originally Posted by DannoXYZ View Post
    ...So I loaned him some 18" motorcycle tyre-levers to mount the tyres. He managed to force the 1st tyre on, but it was completely distorted and the sidewalls were wrinkled and squeezed down between the rim-edges. On the 2nd wheel, he managed to bend and bow out the rim-edges enough that it cracked the rim.

    I told him I'd be more than happy to sell him a set of 700c wheels to go with his new tyres...


    At least you didn't try to play hero and do it for him, then he would have had argument to have you replace the wheels at your cost. Now if it had been a pretty girl, hmm, maybe a different outcome, but it would still be funny.


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    Hey guys, thanks for the replies! I'm off to my local bike store. I guess i'll try to find a 27" tire+tube to fit my wheel. muchas gracias. best regards from switzerland!

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    Oh- you're in Switzerland! That changes a lot. Before buying a new tire, measure the diameter of your rim- It may be a 622 after all- I didn't think that 630's were ever very common in Europe. Remember that the 622 or 630 diameter is the bead seat diameter, so the rim diameter will be a little more.

    The inner tube should fit either diameter.

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    I think the guys who said you could easily do it were referring to putting a 700c wheel onto the bike.

    I prefer to buy my 27" tires online because the selection is better.

  12. #12
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    Lol. Half the posters in this thread didn't even bother to read the OP's post. 27" (630bsd) are a dime a dozen. Hell walmart has them.
    Mes compaingnons cui j'amoie et cui j'aim,... Me di, chanson.

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    Quote Originally Posted by operator View Post
    Lol. Half the posters in this thread didn't even bother to read the OP's post. 27" (630bsd) are a dime a dozen. Hell walmart has them.
    TRUE on both counts ... LBSs though are less likely to have them, I'd heard the line from shops many years ago concerning the scarcity and even had a man offer to try to fit a 700 on my 27" rim ... bad idea. Walmart and the cheaper on-line stores : Performance, Nashbar have plenty.

  14. #14
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    Quote Originally Posted by operator View Post
    Lol. Half the posters in this thread didn't even bother to read the OP's post. 27" (630bsd) are a dime a dozen. Hell walmart has them.
    And others don't seem to realize that there are no Walmarts in Switzerland. Or that 27" tires were pretty rare there.

  15. #15
    Gear Combo Guru Chris_W's Avatar
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    I also live in Switzerland, and I can't remember seeing any 27" tires being sold here. However, amongst the hundreds of tires that veloplus.ch sells, they do stock ONE 27" tire - a 27 X 1 1/4 Schwalbe Marathon for 39 CHF (Swiss Francs), see here, they are even listed as being in stock! Given this, I expect that if your local bike store sells any Schwalbe tires then they can also order this tire from their distributor for you. As stated above, do not try to mount a 700c tire.

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