Tyre size and rim width

[User16625]

Generally how much larger or smaller than a wheel rim can a tyre safely go?
If the wheel is 700*23, is it safe to mount a 700*28 tyre for example.

 

[Mo1959]

Generally how much larger or smaller than a wheel rim can a tyre safely go?
If the wheel is 700*23, is it safe to mount a 700*28 tyre for example.

Near the bottom of this page will give you an idea.

http://sheldonbrown.com/tire-sizing.html

 

[User6179]

Generally how much larger or smaller than a wheel rim can a tyre safely go?
If the wheel is 700*23, is it safe to mount a 700*28 tyre for example.

You can go at least double the width of the rim, usually more but performance will start getting affected especially cornering at speed .