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?
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?