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Wales
by Joske Vermeule, September 1
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Jun 14th, 2026
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Hello - I'm new to this forum and see that tyres have been talked about previously, but I'm curious (slightly concerned) about the different handling of my Plus 4 now I have new rear tyres. The factory fitted Yokohama have been changed to Goodyear Efficient Grip and I have noticed a definite change in the handling. Where the car previously sat firm on the road it now has some bounce to it – tyre pressure 22psi – and would welcome any thoughts?
Plus 4 – Dartmoor
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Joined: Jul 2007
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Member of the Inner Circle
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The tyres are part of the suspension. Old tyre walls harden so that could be part of the issue.
When were the rear springs last greased?
JohnV6
2022 CX Plus Four
2025 Renault Scenic Alpine etech "Yvette"
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Talk Morgan Sage
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Talk Morgan Sage
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G'morning & welcome to the TM madhouse.
John has a point regarding the tyre age hardening. I'm not sure how old your original tyres were, but it is a fact that may affect your instinctive feel. Have you changed the tyre profile ratio with the new tyres I wonder? A taller tyre profile may also affect the bounciness you mention.
Steve
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Charter Member
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25 psi (1,7bar) seems to be right for my car (Vredestein 185/70 15R)
Hannes
once: Green M3W; 2013
now: Red 4/4 Sport; 2011
and some practical cars for use in real life
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John, (V6, um, I fancy one of those) greased in April 17 (about 300 miles ago).
+4 Dartmoor
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Thank you - Car registered in 2010 but tyres 2009. I'm not mechanically technical; by taller profile do you mean all the extra tread on a new tyre?
Andrew +4 Dartmoor
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The 8 year old tyres would have been very hard hence the change.
You can add more air to the tyres if you want but I would advise not to go v high. Say 25 psi
JohnV6
2022 CX Plus Four
2025 Renault Scenic Alpine etech "Yvette"
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Talk Morgan Expert
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Talk Morgan Expert
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I have also just changed from original fitment Yokohama to Good Year efficient grips on my 2011 Plus 4. I certainly noticed the "softer" ride ( and less rattles etc) but am pleased with my choice. The old tyres were getting hard walls and the car now feels more like when it was new and is even a greater pleasure to drive. I went for Goodyear because of economy, wet grip and noise ratings being amongst the best (or so they say) I haven't hammered it into bends yet, but don't feel any less confident.
Doug
2011 Plus 4 in Rich Maroon
1972 750 “ComDom” sprinter
1958 Triton 650
1992 Triumph Trophy 900
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Black Rat Charter Member
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Black Rat Charter Member
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Thank you - Car registered in 2010 but tyres 2009. I'm not mechanically technical; by taller profile do you mean all the extra tread on a new tyre?
Andrew +4 Dartmoor
The profile is denoted by the sizing on the tire so 185/60 is a low profile and 185/70 is a taller profile ie taller from the rim to the tread making the car sit a bit higher.
Keith
2013 narrow bodied + 4 Ruby.
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Hello - ...... now I have new rear tyres.
Dear! You mentioned your tyres aged since 2009. I would strongly recommend to change the front tyres too as soon as possible. While they may still look ok they must have turned hard and will have lost most of their grip. Tyres are a minor expense but the only safe connection to the road!
Hannes
once: Green M3W; 2013
now: Red 4/4 Sport; 2011
and some practical cars for use in real life
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