Home Resources Optimal Tire Sizing Calculator

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)

All Mountain & Trail MTB Tires

The aim for selecting the proper All Mountain and Trial tires comes down to puncture resistance, climbing traction, and corning grip. Fill in the data below to find the best tire width to optimize your performance.

What weather conditions do you typically ride in:

What Surface type do you normally ride on:

Please adjust your inner rim width (in mm)

Enduro & DownHill MTB Tires

The aim for selecting the proper Enduro and Downhill tires comes down to to puncture resistance, traction, and corning grip. Fill in the data below to find the best tire width to optimize your performance.

What weather conditions do you typically ride in:

What Surface type do you normally ride on:

Please adjust your inner rim width (in mm)

Tire Width Results

Supplied Data
& Safety Information

Your Current Tire Selection:

Your Selected Riding Type:

Your Current Rim Inner Width:

Selected Outer Rim Width:

ETRTO Standard Safety Range:
Details

c - c

Recommended
Tire Width

Theoretical Ideal Tire Size

This figure represents the most aero dynamic tire/rim combinations. This size should be used with caution. The ETRTO Safety Standard is conservitive by nature. If this tire size is outside of the ETRTO safety standard we would recommend not using this Theoretical Result. Always consult your rim and tire manufactures for approved tire and rim combinations.

Theoretical Tire Range:

This range represents the most commonly used tire sizes. This size should be used with caution. The ETRTO Safety Standard is conservitive by nature. If this tire size is outside of the ETRTO safety standard we would recommend not using this Theoretical Result. Always consult your rim and tire manufactures for approved tire and rim combinations.

Optional Front Tire Setup

Many riders find that running a larger tire in the front creates better grip and traction when handling the bike. Please check that your bike can support these tire clearnences.

If both values (Recommended Tire Width & Front Tire Setup) are the same it is because the ETRTO Safety Standards cannot recommend larger or smaller tires. Always consult your rim and tire manufactures for approved tire and rim combinations.

Optional Front Tire Setup

Many riders find that running a larger tire in the front creates better grip and traction when handling the bike. Please check that your bike can support these tire clearnences.

Optional Front Tire Setup

Many riders find that running a larger tire in the front creates better grip and traction when handling the bike. Please check that your bike can support thesetire clearnences.

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.

Book an Appointment now or call

+49 8091 3939057

Book an Appointment Call at +49 8091 3939057

Tire Size Calculator