The CB 350 RS tyre pressure for solo riding is 29 psi at both wheels, and the back needs 33 psi whenever someone sits behind you, all measured cold. Nothing changes up front for two up use.
Cold here means the RS sat unused since early morning, or crawled no further than the end of your lane. Honda's booklet lists these numbers. A figure cast into the rubber is the ceiling that tyre can bear, unrelated to the setting your RS should run.
CB350RS fitment card
- Front tyre
- 100/90-19 tubeless
- Rear tyre
- 150/70-17 tubeless
- Wheels
- 19 inch front, 17 inch rear, alloy
- Tyre pressure (cold)
- Front 29 psi, rear 29 psi solo; rear 33 psi with a pillion
Honda CB350 RS tyre pressure chart
| Load | Front (100/90-19) | Rear (150/70-17) |
|---|---|---|
| Rider only | 29 psi | 29 psi |
| Rider and pillion | 29 psi | 33 psi |
The only change for two up riding is at the rear. Top up those extra 4 psi before a passenger boards rather than mid trip, and bleed them off once you go back to solo commuting. Left at 33 psi with one rider, that broad back tyre hops over ripples.
Converting the RS numbers to bar and kPa
| psi | bar | kPa |
|---|---|---|
| 29 | 2.0 | 200 |
| 33 | 2.3 | 228 |
Many digital air machines and pocket gauges switch between units. If yours reads in bar, set 2.0 for both tyres solo, then roughly 2.3 behind when carrying two. Our tyre pressure converter handles other values.
Topping up the RS at a fuel station air machine
- Use the air point closest to where the bike sleeps, so tyres are still near cold.
- On the 19 inch front, the valve hides near the disc. Roll the bike a little until the stem points down and the hose reaches it cleanly.
- Key in 29 psi, press the nozzle square on the stem until the display confirms.
- Do the rear, at 29 or 33 depending on load.
- Every few weeks, compare the machine with a pocket gauge of your own; station units drift.
- Refit both caps, since grit in a valve core causes slow leaks.
Checking CB 350 RS tyre pressure when the tyres are warm
Twenty minutes of highway riding can push each reading up by 2 to 4 psi. Expect that. Bleeding a warm tyre back to 29 means it ends up soft by evening. When you have no choice but to fill warm, aim 2 to 3 psi above the cold number and verify at dawn the following day.
How wrong pressure shows up on the RS
- Too low at the front: the tall 19 inch tyre feels heavy at walking speed and drifts wide in corners. The edges wear fast.
- Too low at the rear: the wide 150 tyre squirms, heats up on expressways and can be damaged by a sharp pothole hitting the rim.
- Too high: every speed breaker jolts through the bars, less rubber touches the road and wet tar turns slippery.
Needing a top up every week points to a hidden nail or a weeping valve core; ask a tyre shop to trace it with soapy water.
Monsoon and touring advice
Dropping pressure in the rains does not add grip. Correctly inflated tyres hold their tread channels open, which is what pushes water out from under the bike. On a long tour with luggage and a pillion, run 33 psi at the rear and check both tyres every morning before setting off. For gravel or unpaved stretches, some riders drop a few psi for comfort; put it back before returning to tar. More general tips live in the tyre pressure hub and in our guide for motorcycles.
Sizes the pressures are set for
These figures are for the factory 100/90-19 front and 150/70-17 rear. If you fit a different size or a dual purpose tyre, ask the tyre maker whether it needs a different pressure. Full size details are on the CB350RS tyre size page. Owners of the related H'ness tyre pressure page will find a similar chart for that bike.
Questions owners ask
What is the CB350RS tyre pressure for one rider?
29 psi in each tyre, cold, which equals 2.0 bar on a gauge that reads in bar.
What is the Honda CB350 RS tyre pressure with a pillion?
Leave 29 psi in front and put 33 psi in the back, filled before departure while tyres are cool.
Is nitrogen worth it for CB 350 RS tyres?
A nitrogen fill holds its pressure a bit longer, but regular air does the same work on an RS when the gauge shows 29. Checking often beats any choice of filling gas.
Why does my rear tyre read 33 psi after a ride when I filled 29?
Tyres heat up while riding and the air expands. That is normal. Check again when the bike has cooled.
Can I run lower pressure for a softer ride?
Small drops for a gravel section are fine, but riding long distances underinflated heats the tyre and damages it. Use the manual figures for road riding.