Have cracks of tyres on two bicycles.

See attached photos. Bicycle 1 (top), 2 (bottom).

enter image description here

It isn't dry rot ( What are these cracks in the side of my bicycle tyre called? Does this mean that my tyre is gone? )

Bicycles purchased second hand, have been in active use for around two years, approximately 5km per day each 3-4 days a week.

Do these tyres all need replacement ?


  • 1
    You need to make sure you have enough air in the tire. Commented May 7, 2022 at 12:20

1 Answer 1


Looks harmless. It could increase your risk for punctures slightly. If you have very bad luck a knob of the knobby tyre could break off.

But it’s not like your tyre is suddenly going to explode. The rubber is just there for grip and puncture protection. As long as the underlying fabric is intact it will hold pressure.

For the future, make sure you always have enough pressure in the tyre and store them out of the weather if possible. From personal experience it’s mostly a problem with cheap, low quality tyres though.

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.