Appropriately inflated tyres conform better to imperfections in the road, absorbing impacts and allowing you to ride more efficiently and safely with more comfort and control. As mountain bikers have known for a long time, tyres that are inflated to a higher pressure than necessary for the terrain transmit more impacts and sacrifice speed as well as energy as the rider fights to keep the bike on track and to stop it from deflecting off obstacles, however small, in its path.


This calculator gives recommended tyre pressure for Giant and CADEX hookless rim road wheels and compatible road tyres.

Please be aware that the pressure recommendation given here is a starting point and that you may need to add or release a little air to find the perfect number for your bike set up and riding conditions.

Rider Weight
Tyre size
Inner Rim Width

Recommended tyre pressure

psi / bar


  1. Never exceed the maximum (MAX) tyre pressure indicated on the rim, the tyre or the rim tape.

  2. Please note that the stated MIN pressure on many current Giant tyres (e.g. 85psi for 25C tyre) was originally defined based on a durability test with a 120kg load at 1.5 times the regulated distance. CURRENTLY, for all Giant tyres this minimum (MIN) pressure can now be defined as 70 psi (4.8 bar) for 23C & 25C tyres, 50 psi (3.4 bar) for 28C tyres and 45 psi (3.1 bar) for 32C tyres. Never inflate to less than the MIN pressure.

  3. The above pressure values are recommended starting points only.

  4. Please be aware that the load limit of all Giant Road WheelSystems is 129kg. This includes the weight of the rider + bike + luggage. For your own safety, please do not exceed the load limit, and please note that it is never advisable to load the bike to its maximum capacity.


Refer to the inflation recommendation chart above to find a “starting pressure” based on your weight, the volume of the tyre and inner width of the rim. Go for a ride. If you find the ride quality too harsh or that you are losing traction, lower the tyre pressure a few psi. On the other hand, if you find the bike is too sluggish or the tyres feel much too soft under your weight, add some psi.

Pay close attention to how soft your rear wheel and tyre feel under your weight, especially as you cover rough ground; if you can feel the rim through the tyre after hitting a bump, add some psi immediately. Repeat step 2 and step 3 until you find a pressure that offers the perfect balance of rolling performance, comfort, support and grip.

Don’t hesitate to experiment within the limits presented here and don’t forget that hookless and tubeless technology allow you to run significantly, even surprisingly, lower tyre pressures than you may have been traditionally accustomed to.


Alter your tyre pressure based on the surface you’re riding on:

Conventional road wisdom has always held that 100 psi (6.9 bar), more or less, is the magic number for speed and compliance, and on brand-new smooth pavement or at the track, your tyres could feel great inflated to that pressure. However, when riding on anything other than a perfectly smooth surface (which, if we’re honest, is what most of us ride on most of the time), we recommend taking advantage of the benefits of tubeless and hookless technology and going with 10-15 psi / 0.7-1.0 bar less than what you might have normally put in (around 85-90 psi / 5.9-6.2 bar in the case of 100 psi / 6.9 bar mentioned above, for example). This allows the tyre to conform better to imperfections in the road, reducing deflection and wasted energy as well as eliminating a harsh, chattery ride feel. Likewise, in wet conditions, just 10 psi / 0.7 bar less than what you usually might run will give you an increased contact patch and much better grip.

Adjust your tyre pressure according to the volume of the tyre you’re using:

90 psi / 6.2 bar could be perfect for your weight and the road surface when you’re on 25c tyres, but if you decide to swap out to wider 28c tyres, you’ll be increasing tyre volume significantly, which means if you want the same smooth and supple ride quality from your new tyre size, you’ll have to adjust air pressure downward to accommodate.

Adjust your tyre pressure based on your weight:

tyres support the weight of the rider plus the bike plus any luggage or gear; for this reason, heavier riders require more pressure and lighter riders require less. As such, it’s essential to adjust your tyre pressure according to your weight rather than try to use a “one pressure fits all” measurement (like the magic 100 psi / 6.9 bar we mention above!).

Never inflate over the maximum tyre pressure indicated on the rim, the tyre and /or the rim tape:

To make sure every ride is safe, Giant provides a recommended maximum (MAX) tyre pressure, indicated either on the rim, the tyre or the rim tape. You should never inflate your tyre beyond that pressure.

Maximum tyre pressure is NOT the recommended tyre pressure:

To make sure every ride is great, Giant recommends that you never inflate your tyres up to the maximum pressure either. Inflating to maximum pressure is unnecessary and for the reasons discussed above can give a harsh, unpleasant and potentially dangerous ride experience. Instead, Giant recommends following the inflation advice and pressure guide presented here.

Check your tyre pressure before every ride:

This goes all the way back to the beginning: Appropriately inflated tyres conform better to imperfections in the road, absorbing impacts and allowing you to ride more efficiently and safely with more comfort and control. A one minute pressure check before each ride to ensure your tyres are appropriately inflated can make the all the difference!

What Tyres Can I Use?

Giant WheelSystems are built to be used as a system and Giant and CADEX tyres are always the best choice. However, should you prefer to run a non-Giant or CADEX tyre, select tyres with an indicated maximum pressure above 72.5psi (5 bar) that have passed the Giant test protocol for use with Giant hookless rims:

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