Question 1

What PSI should I run on a road bike?

Accepted Answer

For 75 kg total system weight on 28mm tubeless tires and 700C wheels, expect a starting point of roughly 79.5 PSI / 5.5 BAR front and 81.5 PSI / 5.6 BAR rear on smooth new pavement. Worn pavement with some cracks drops that to about 75 PSI / 5.2 BAR front and 77 PSI / 5.3 BAR rear, and poor pavement or chipseal drops further to roughly 69 PSI / 4.7 BAR front and 70.5 PSI / 4.9 BAR rear. Use the calculator above for your own weight and measured width, then test and adjust from there.

Question 2

Is this road bike calculator based on SILCA's methodology?

Accepted Answer

Yes. It runs the same impedance-breakpoint formula as SILCA's own professional tire pressure calculator: an estimate of the pressure at which more air stops lowering rolling resistance and starts costing you speed to vibration instead, worked out here for road surfaces, tire widths and wheel sizes. Treat the result as a starting point for testing, not a fixed target.

Question 3

How much lower should road tire pressure be for wider tires?

Accepted Answer

Substantially lower. For 75 kg total system weight on new pavement at 700C, this calculator's starting point is about 95 PSI front / 97 PSI rear at 25mm, dropping to 79.5 / 81.5 PSI at 28mm, 71 / 73 PSI at 30mm, and 64 / 66 PSI at 32mm. Wider tires deform less per PSI, so they need less air to reach the same estimated breakpoint. The old '23mm at 120 PSI' guidance just doesn't apply to modern wide road tires.

Question 4

Does tubeless always mean lower road tire pressure?

Accepted Answer

Not necessarily — this is a common mix-up. The Tire Type input is really a casing-quality spectrum, not a simple tubed-vs-tubeless switch. At 75 kg total system weight on 28mm new-pavement tires, high-performance tubeless computes 81.5 PSI rear, a mid-range butyl-tube clincher computes 76.5 PSI rear, and puncture-resistant tubeless (stiffer and heavier for durability) computes 74 PSI rear — lower than the clincher, despite also being tubeless. What tubeless actually removes is inner-tube snakebite risk at a given pressure; it doesn't automatically mean a lower number from this calculator, and it doesn't remove the risk of casing damage, rim strikes or burping if you run too little air.

Question 5

Should road bike front and rear tire pressure be different?

Accepted Answer

Yes. Road bikes carry roughly 48% of system weight over the front wheel and 52% over the rear, so the rear tire needs a couple of PSI more than the front for the same tire drop and contact-patch shape. This calculator applies that 48/52 split automatically to every result.

Question 6

What tire width does this calculator support for road bikes?

Accepted Answer

20mm through 35mm measured width, covering classic 23–25mm racing tires, the modern 28–32mm standard, and wider all-road tires up to 35mm. Always enter the tire's actual inflated measured width on your rim, not the number printed on the sidewall, since modern wide rims often measure several millimeters wider than the labeled size.

Question 7

Why doesn't this calculator include gravel or MTB surfaces?

Accepted Answer

Road riding sticks to a handful of surfaces, so that's what you'll find here: new pavement, worn pavement, poor pavement/chipseal and cobblestone. If you spend most of your time on gravel or trail, the Gravel or MTB calculator gives you a starting point built around those surfaces and tire sizes instead.

Question 8

How is this different from an old road tire pressure chart?

Accepted Answer

Older charts were built around narrow 21–23mm tubed tires and often recommend 100+ PSI regardless of your actual setup. This calculator runs the SILCA impedance-breakpoint formula directly on your total system weight, measured tire width, surface and casing type, which is what accounts for the much wider, lower-pressure tubeless tires common on modern road bikes.

Question 9

What tire pressure should I run for cobblestone sectors or rough pavement?

Accepted Answer

Rough surfaces reward lower pressure for comfort and control, not higher. For 75 kg total system weight on 28mm tubeless tires, this calculator's starting point drops from about 81.5 PSI rear on new pavement to roughly 63 PSI rear on cobblestone — a meaningful cut that reduces vibration losses on rough surfaces even though it feels backwards if you're used to 'more air for rough roads' advice.

Question 10

What tire pressure should I run for Continental Grand Prix 5000 (GP5000)?

Accepted Answer

For Continental GP5000 (standard clincher with butyl tube) or GP5000 S TR (tubeless), input your total system weight and select measured tire width (a 28mm GP5000 often measures 29–30mm on modern 21mm internal rims). For tubeless GP5000 S TR, select 'High-performance tire tubeless/latex tube'; for standard GP5000 with tubes, select 'Mid-Range casing butyl tube'. If you run GP5000 S TR on hookless rims, look up Continental's and your rim maker's published maximum for your exact tire width (commonly 72.5 PSI / 5 BAR) and never exceed it, whatever this calculator returns.

Surface Condition	Front PSI / BAR	Rear PSI / BAR
New Pavement	79.5 PSI (5.5 BAR)	81.5 PSI (5.6 BAR)
Worn Pavement / Some Cracks	75 PSI (5.2 BAR)	77 PSI (5.3 BAR)
Poor Pavement / Chipseal	69 PSI (4.7 BAR)	70.5 PSI (4.9 BAR)
Cobblestone	61.5 PSI (4.2 BAR)	63 PSI (4.3 BAR)

Road Bike Tire Pressure Calculator

Baseline Tire Pressure at 75 kg Total System Weight

Get Your Road Bike Tire Pressure

How to Use This Calculator

1Enter Your Total System Weight

2Select Road Surface Condition

3Measure Your Tire Width

4Choose Wheel Diameter & Tire Type

5Set Average Speed

6Calculate & Use Your Results

How Road Bike Tire Pressure Works

Road tire pressure by width (75 kg total system weight, new pavement, 700C, high-performance tubeless)

Does casing type change road tire pressure?

Front vs. rear on the road

Key factors that move your road bike pressure

Frequently Asked Questions

More SilPSI Tire Pressure Calculators