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  • Currently running a 27mm Conti GP tire in rear (steel framed bike) and the tire has close clearances: 2-3mm between the tire and chainstay/seatstay bridges and both chainstay sides.

    I had some spare links but think they were thrown out..even moving the tire back a 1/2" won't do much..maybe add an extra mm.

    I did a 30+ mile ride the other day and couldn't find any rub marks/hear rubbing sounds. The bike has an almost silent drivetrain so I would hear it.

    The tire is almost new and I don't want to bin it...how safe is super tight clearances in the rear on a steel framed bike (since they do flex)?
    I'm purchasing 25mm soon for front/rear but curious if this is even safe.

  • you rode it and it was fine = it's fine

  • how safe is super tight clearances in the rear on a steel framed bike (since they do flex)?>

    Not only do steel frames flex but wheels sometimes go out of true. It is, in general, not a great to push things to their limits. If 27mm is tight I'd keep to 25mm or less. Why do you think you need 27mm? Why do you want 27mm?

  • Dude, you're just looking for a problem that doesn't exist.

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