Tire Size Calculator

Road, Gravel, Mountain

Select Your Riding discipline:

The bike tire can greatly improve the performance of your bike but vast amount of tires on the market today can make it difficult to find the proper tire to fit your rim.

Welcome to the CSBikes tire size calculator, this tool will recommend the proper tire for your rim and riding style.



Road Tire & Time Trial

The aim for selecting the proper road/tt tire comes down to rolling resestance and aero dynamic profile. Fill in the data below to find the best tire width to optimize your performance.


Which Tire Technology Would Like to Use

Please adjust your INNER rim width (in mm)

Please adjust your OUTER rim width (in mm)

ETRTO Safety Standards

Rim Width (mm) 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
20c - 21c Tire X X X
22c - 24c Tire X X X X X
25c - 27c Tire X X X X X X X X X
28c - 36c Tire X X X X X X X X X X X
37c - 39c Tire X X X X X X X X X X
40c - 41c Tire X X X X X X X X X
42c - 46c Tire X X X X X X X X X X
47c - 51c Tire X X X X X X X X X X X X
52c - 54c Tire X X X X X X X X X X X X X X
55c - 63c Tire X X X X X X X X X X X X
64c - 65c Tire X X X X X X X X X X
66c - 71c Tire X X X X X X X X
72c - 83c Tire X X X X X X X
84c - 99c Tire X

Tire Pressure Calculator Limitations

CS|Cycling-Sport's tire pressure calculator is to be used as a reference tool for end-users. Please respect the ETRTO guidelines limiting maximum tire pressure to 72.5 psi / 5 bar for Tubeless Straight Sidewall (TSS) or ‘Hookless’ type rims. This tool should be used strictly as a resource, and no warranty or guarantee is granted.

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