An uncomfortable ride does not necessarily mean you need to replace the suspension immediately. First, distinguish what feels uncomfortable.
A sharp jolt over a bump. Continued bouncing after passing it. Steering-wheel vibration at a particular speed. Or fatigue from sitting despite little body movement. Each calls for a different starting point.
This article reworks the former LANDMASTER ride-comfort column around the order of inspection and decisions before purchasing. Our separate guide to enjoying a more comfortable kei car also covers ideas for everyday use.
First, describe the discomfort.
| What you feel | Where to start | Useful information to record |
|---|---|---|
| A strong impact over bumps | Pressure, tire specification and suspension modification history | Whether it changed after tire replacement or a ride-height change |
| Bouncing continues after a bump | Have a workshop inspect suspension condition | Speed, load and direction of movement |
| Steering wheel or seat vibrates | Inspection including tires, wheels and suspension | Specific speed, acceleration, braking or other conditions |
| Uncomfortable posture | Seat position, backrest and distance to the steering wheel | Where you feel strain and how long it takes to develop |
This table is not a diagnosis. If strong vibration, unusual noise or unstable handling develops suddenly, stop somewhere safe and arrange an inspection.
1. Check tire pressure and condition first.
Excessively high pressure can make impacts feel harsher and worsen ride comfort. Pressure that is too low can cause problems including excessive deflection, heat and uneven wear. Do not release air merely to make the ride softer; check the correct pressure for your vehicle and tires. Dunlop: tire pressure (Japanese)
Along with pressure, examine tread wear, cuts, cracks and sidewall bulges. Measure with a gauge rather than judging pressure by appearance. JATMA also recommends monthly tire checks. JATMA tire guidance (Japanese)
If the change followed new tires, identify what changed.
Compare the tire model, size, wheels and recommended pressures before and after replacement. Larger wheels can have disadvantages such as a firmer ride, so balance appearance against intended use. Bridgestone: benefits and drawbacks of larger wheels (Japanese)
After changing tire size or load requirements, ask the retailer whether the previous pressure remains appropriate. Quietness and impact absorption are also different qualities. Explain which one you want to improve.
2. Adjust the seat before adding accessories.
Before placing anything on the cushion, check the adjustment range of the existing seat. Review fore-aft position, height, backrest and lumbar support where fitted.
For example, Toyota's instructions advise adjusting the seat for a correct driving position and avoiding excessive backrest recline. Follow the instructions for your own vehicle. Toyota: example front-seat adjustment instructions (Japanese)
If considering a cushion, do not choose by thickness alone. Check that it does not interfere with pedal operation, visibility or seat-belt positioning. Try the vehicle's own adjustment features before using an unsuitable accessory to force a posture.
Not all driving fatigue should be attributed to the car. If tired or sleepy, take a break independently of any ride-comfort changes.
3. If bouncing persists, have the suspension checked.
Springs compress and extend in response to the road. Shock absorbers help settle the resulting excess movement. KYB explains their role in vehicle stability and ride comfort. KYB: what shock absorbers do (Japanese)
If bouncing lasts longer than before, noises come from the suspension or tire wear looks unusual, arrange an inspection that includes related components. Confirm the condition and obtain an estimate rather than choosing replacement parts solely from the sensation.
Steering-wheel vibration alone does not establish an alignment fault.
The older column discussed the relationship between high-speed steering vibration and alignment. This edition treats the symptom as a reason to inspect tires, wheels and suspension, rather than deciding the cause from the symptom alone.
A useful way to explain it to a workshop is:
“Since changing the tires, I have felt steering-wheel vibration at a particular speed. I would like to check whether it happens only during acceleration or also at a steady speed. Please inspect the tires and wheels as well.”
Describe when, during which operation and where you feel it before ordering work based on an assumed cause.
4. Compare on the same road under similar conditions.
After inspection or adjustment, assess the car on a familiar road while following traffic rules and keeping those around you safe. Keep the route, speed, occupants and luggage as consistent as possible. Record impacts, lingering bounce, sound and control feel separately.
Changing tires, suspension and seat accessories at once makes it harder to identify what helped. Complete necessary repairs first, then make preference-based adjustments one at a time.
5. Consider your preferred driving feel after restoring normal vehicle condition.
Addressing faults or inadequate servicing is separate from evaluating the feel of a healthy vehicle. NEXT SCIENCE's ORBITRON products do not repair worn shock absorbers or damaged tires.
Once those basics are addressed, compare the Comfort, Street and Racing design objectives when considering everyday control feel in kei cars or compact cars. Compare 660C, 660S and 660R
To explore an introductory option on your own vehicle, check the specifications and compatibility conditions for the Micro Reactor Trial. Product-related changes are not uniformly guaranteed. Select according to the design purpose and actual conditions of use.
Conclusion: start with the part of the ride that bothers you.
Is it an impact, lingering bounce, vibration in particular conditions or discomfort from posture? Making that distinction makes pre-purchase checks more specific.
Check pressure and tire condition, seating adjustment and suspension condition in that order. Complete necessary servicing before considering products for your application and preferences.
Car, motorcycle and machinery product guide / Ask about products with your vehicle and application details
Sources and revision history
Re-edited on September 7, 2026, from the themes of LANDMASTER's January 29, 2018 column, What to do when a car's ride feels uncomfortable (Japanese). General explanations of tires, seats and suspension draw on the manufacturer and industry-body information linked in this article. These explanations are not test results verifying ORBITRON performance.
Choose ORBITRON for your vehicle and how you use it
For those considering everyday control feel after necessary inspection and servicing, our guide explains the 660 series, Micro Reactor Trial and individually offered ZF-R, together with checks before installation.