Why 28mm tyre pressure matters
A 28mm road tyre is one of the best all-round options for modern bikes: fast on smooth roads, stable on rough surfaces, and comfortable for long rides. But the pressure has to be right. Too high, and the bike feels harsh and skittish. Too low, and you risk rim strikes, sluggish handling, or tyre squirm.
The goal is not to chase the highest PSI. The goal is to find the pressure that minimizes energy loss while preserving control and comfort. On real roads, that usually means running lower pressure than older 23mm tyre recommendations.
How this calculator works
This 28mm tyre pressure calculator uses your system load (rider + bike), then splits that load between front and rear wheels. It adjusts pressure based on tyre setup, road quality, and conditions.
- Weight: heavier systems need higher pressure to support load.
- Front/rear balance: rear tyre usually needs more pressure because it carries more load.
- Tyre setup: tubeless can usually run lower pressure than butyl tubes.
- Road surface: rough roads benefit from lower pressure for reduced vibration losses and improved grip.
- Wet weather: a small pressure reduction helps traction and confidence.
Quick starting chart for 28mm road tyres
For typical mixed roads and balanced riding style, these examples are common starting points (tubeless setup):
- System weight 65 kg: ~45 PSI front / ~55 PSI rear
- System weight 75 kg: ~52 PSI front / ~62 PSI rear
- System weight 85 kg: ~58 PSI front / ~69 PSI rear
- System weight 95 kg: ~64 PSI front / ~76 PSI rear
Your exact number may differ based on wheelset, rim width, tyre casing, and how aggressively you corner.
How to fine-tune after your first ride
Signs your pressure is too high
- Bike chatters or skips across rough corners.
- Hands and shoulders feel fatigued early.
- Reduced grip on imperfect pavement.
Signs your pressure is too low
- Tyre feels vague in hard cornering.
- Frequent rim hits on potholes or sharp edges.
- Bike feels draggy while climbing or sprinting.
Simple tuning method
Change only one variable at a time. Move in 1-2 PSI steps, test on the same route, and take notes. Most riders can find their “sweet spot” in 2-3 rides.
Common mistakes riders make
- Using old high-pressure habits from 23mm tyres.
- Ignoring actual tyre width (many 28mm tyres inflate to 29-31mm).
- Running equal front and rear pressure without considering load split.
- Not adjusting for wet weather or poor road quality.
- Exceeding tyre or rim pressure limits shown by the manufacturer.
Frequently asked questions
Should front and rear pressure be the same?
Usually no. Rear pressure is normally several PSI higher because the rear wheel carries more weight.
PSI or bar — which should I use?
Use whichever you prefer. This calculator outputs both. (1 PSI ≈ 0.069 bar.)
Does this work for inner tubes and tubeless?
Yes. Select your setup. Tubeless often allows lower pressure while maintaining speed and comfort.
Can I use these numbers on indoor trainers?
For direct-drive trainers, tyre pressure is not relevant. For wheel-on trainers, use a separate trainer tyre recommendation.
Final note
Think of tyre pressure as a performance setting, not a fixed rule. The best number depends on your roads, your setup, and your goals. Use this calculator as your baseline, then refine in small increments until the bike feels fast, stable, and predictable.