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I was reading over the tire spec sticker that is in the glove box the other day. I noticed 2 different tire pressure driver and driver with passenger. I'm 300lbs should I inflate tires to the ride and passenger stander sometime alone I sit a little more back.
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UTC quote
I think they rate the average rider at 170# (obviously not just American riders) and you only a couple pounds over that so you probably good at the solo pressure
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UTC quote
I'm 240, and carry around a lot of parts and tools and stuff. I inflate both my tires to 32 psi. The scooter handles well, the tires wear well, and I seem to be one of very few that don't have that "wobble" when I take my hands off the bars.
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...
⚠️ Last edited by SteelBytes on UTC; edited 2 times
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From an experienced tire fitter, yes inflate to 2.4/ 2.6 bar and check regular in summer and winter extreme heat and cold, due to contraction and expansion, remember its only a small part of the tire that keeps you upright, inflation is critical.
You may also want to adjust your rear suspension to passenger bearing weight.
cheers.
UTC

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UTC quote
SteelBytes wrote:
...
Yes and no…

It is not the maximum values BUT at least the value for rear tire with pillion is wrong (2.6 bar)!!! According to manual: rear with pillion 2.2 bar (=31,9psi)
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⚠️ Last edited by GermanGTSDriver on UTC; edited 1 time
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UTC quote
BUGGSY wrote:
From an experienced tire fitter, yes inflate to 2.4/ 2.6 bar and check regular in summer and winter extreme heat and cold, due to contraction and expansion, remember its only a small part of the tire that keeps you upright, inflation is critical.
You may also want to adjust your rear suspension to passenger bearing weight.
cheers.
I can adjust stock suspension
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Hi, These specs are taken from Piaggio Technicians manuals for each model.
But also remember in the manual it also states to use (PIAGGIO APROVED TIRES), and also remember speed and load rating alters from a top of the range tire to a budget tire.

LX, LXV and S models
Front Rear
Rider only, Front, 23 psi (1.6 Bar) Rear, 29 psi (2.0 Bar)
Rider and passenger Front, 23 psi (1.6 Bar) Rear, 33 psi (2.3 Bar).
----------------------------------------------------------------------------
GTS, GTS Super, GTV, GT and Sprint models
Front Rear
Rider only, Front,26 psi (1.8 Bar) Rear, 29 psi (2.0 Bar)
Rider and passenger Front, 26 psi (1.8 Bar) Rear, 32 psi (2.2 Bar)
-----------------------------------------------------------------------------
Primavera
Front Rear
Rider only, Front, 23 psi (1.6 Bar) Rear, 26 psi (1.8 Bar)
Rider and passenger Front, 23 psi (1.6 Bar) Rear, 29 psi (2.0 Bar).

Hope this helps further to my previous answer.
Cheers.
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UTC quote
Sadragna wrote:
I can adjust stock suspension
I have my rear spring preload set to max.
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VintageScooterDude wrote:
I have my rear spring preload set to max.
How do you adjust that
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Sadragna wrote:
How do you adjust that
At the risk of it sounding bad

It's in the user manual
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It's worth playing around with different settings for PSI and finding out what works for you. Go right up to the max for the rear, have a ride for a day, then go to the lowest and ride on similar roads. You'll then clearly be able to feel how it influences the handling.

Try and only change one wheel PSI at a time, or the rear suspension setting - don't do multiple changes at once.
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With scooters, due to the engine weight being at the rear rather than more evenly distributed as with a motorcycle, I do tend to err on the side of using the pillion recommedations as I believe it may make them a little more resistant to a puncture. I would always road-test it though, just to be sure that there are no adverse effects.
Perhaps the most important point is to check the pressures yourself with a gauge, at least weekly and definitely before any long or extended ride. Giving them a kick or a pinch with the fingers, will NOT be sufficient!
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UTC quote
Sadragna wrote:
How do you adjust that
Or the wiki:

Proper way to adjust shock preload
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UTC quote
Clampett wrote:
I think they rate the average rider at 170# (obviously not just American riders) and you only a couple pounds over that so you probably good at the solo pressure
Hey! I'm an American (unfortunately) and I'm only 162 lbs!
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UTC quote
BUGGSY wrote:
Hi, These specs are taken from Piaggio Technicians manuals for each model.
But also remember in the manual it also states to use (PIAGGIO APROVED TIRES), and also remember speed and load rating alters from a top of the range tire to a budget tire.

LX, LXV and S models
Front Rear
Rider only, Front, 23 psi (1.6 Bar) Rear, 29 psi (2.0 Bar)
Rider and passenger Front, 23 psi (1.6 Bar) Rear, 33 psi (2.3 Bar).
----------------------------------------------------------------------------
GTS, GTS Super, GTV, GT and Sprint models
Front Rear
Rider only, Front,26 psi (1.8 Bar) Rear, 29 psi (2.0 Bar)
Rider and passenger Front, 26 psi (1.8 Bar) Rear, 32 psi (2.2 Bar)
-----------------------------------------------------------------------------
Primavera
Front Rear
Rider only, Front, 23 psi (1.6 Bar) Rear, 26 psi (1.8 Bar)
Rider and passenger Front, 23 psi (1.6 Bar) Rear, 29 psi (2.0 Bar).

Hope this helps further to my previous answer.
Cheers.
I am riding a 2023 Primavera 150. Both the manual and the tire placard on the bike say:
Front: 1.8 bar, 26.1psi
Rear: 2.0 bar 29psi for single rider and 2.5 bar 36.2psi with passenger

It is undoubtedly different for different models bikes.
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UTC quote
A combination of tire pressure and rear shock preload setting will work together.

Given the OP weight, I would recommend preload setting at 1 less than max, and tire PSI on the rear at 35. Ride for a bit at those to see if that works for you. By yourself, you're not at the max vehicle weight limit. So start with settings that give you a bit of wiggle room.

There's no perfect solution for all riders, riding style, and conditions.

But don't ever go Below the lowest PSI recommendation. That applies for all riders.
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UTC quote
For me 31-32psi (2.2 bar) on the front and 34-36psi (2.4 bar) on the rear works best for me with the City Grip 1 or 2s on my GTS as it gives me the best ride and handling. If I let the front get below 28 and rear below 32 there is a tendency to the infamous wobble.
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These pressures was taken from genuine Italian Vespa technician manuals (circa 2008).
I had a Primavera some years ago.
If you take the original small frame 1968 primavera 2 stroke to the current 2023 primavera as you are riding, the two tires are carrying a lot more unladened weight as over the years the models weight has increased significantly, hence you have more tire pressure in you 2023 Primavera

Would it not be fair to say different year of manufacture.
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UTC quote
BUGGSY wrote:
These pressures was taken from genuine Italian Vespa technician manuals (circa 2008).
I had a Primavera some years ago.
If you take the original small frame 1968 primavera 2 stroke to the current 2023 primavera as you are riding, the two tires are carrying a lot more unladened weight as over the years the models weight has increased significantly, hence you have more tire pressure in you 2023 Primavera

Would it not be fair to say different year of manufacture.
Exactly, two different model years.
The 2023 Primavera 150 is riding on 12x3.00" wheels front and back. Tires are:
Front 110/70-12 47P
Rear 120/70-12 58P

Kerb weight is 127kg (279.4 lbs).

Perhaps the 2018 was different? The specs of the bike change (weight, geometry, suspension, etc.), so the tire specs will too. I used to work for a motorcycle tire manufacturer. They work closely with the manufacturers of the bikes to find a good fitment and the best tire pressure to ride at (for safety, handling, and comfort).

This all goes for your four wheel vehicles too.
Cheers!
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Exactly right, and without Formula 0ne Race technology and research our road vehicles would not be as so advanced as they are today.
Best regards.
⬆️    About 7 months elapsed    ⬇️
UTC

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2023 Vespa Sprint S 150
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UTC quote
Why is this so confusing to you people? Listen Up:

If you have a new Vespa 150, Primavera or Sprint [it doesn't matter the tire pressure is the same].

Forget the bars, Americans only know PSI !!!!!! got it. OK
I ride a 2023 Vespa 150 Sprint S:

Front tire 26 PSI
Rear tire 29 PSI

One more thing, I don't carry passengers.
Oh Yeah!
Oh Yeah!
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Popcorn emoticon
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UTC quote
JC4VR wrote:
Why is this so confusing to you people? Listen Up:

If you have a new Vespa 150, Primavera or Sprint [it doesn't matter the tire pressure is the same].

Forget the bars, Americans only know PSI !!!!!! got it. OK
I ride a 2023 Vespa 150 Sprint S:

Front tire 26 PSI
Rear tire 29 PSI

One more thing, I don't carry passengers.
Comin' in kinda hot, but welcome to MV JC4VR!
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UTC quote
I admittedly am horrible about checking tire pressure. I know - bad on me.
I might check the tire pressure once or twice a season. I do check to see that they are not flat each time I ride.

My newer Kymco AD550 has a bundle of electronics - it actually informs you on the dash if your tires are low.

I do all my service at my local dealer and have them top/check tire pressure.

Bob Copeland
Full of Hot Air
⬆️    About 2 months elapsed    ⬇️
UTC

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GTS 150 Super
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UTC quote
Front 1.8bar (26psi) and Rear 2.0bar (29psi) are accepted as the correct pressures for a GTS 300.

Any thoughts on to why the owners manual of both my 2022 GTS 300s specify Front 2.0bar (29psi) and Rear 2.3bar (33psi) ?

Seems inconsistent with every tire placard and other manuals that exist.
GermanGTSDriver wrote:
Yes and no…

It is not the maximum values BUT at least the value for rear tire with pillion is wrong (2.6 bar)!!! According to manual: rear with pillion 2.2 bar (=31,9psi)
Forum member supplied image with no explanatory text
Forum member supplied image with no explanatory text
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UTC quote
Spiz wrote:
Any thoughts on to why the owners manual of both my 2022 GTS 300s specify Front 2.0bar (29psi) and Rear 2.3bar (33psi) ?

Seems inconsistent with every tire placard and other manuals that exist.
Can't expain all the inconsistancies, but those numbers are about what works best for me on my GTS.
⬆️    About 2 months elapsed    ⬇️
@paws619 avatar
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UTC quote
Good morning! I have recently returned to scooters but have ridden motorcycles for over 40 years. I do a fair bit of long distance riding and tire pressure is often on my mind. Found this article online some time ago and wanted to share it here. https://americansporttouring.com/find-the-best-tire-pressure-for-your-motorcycle/
@steelbytes avatar
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2019 GTS300 HPE SuperTech 66,000km
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@steelbytes avatar
2019 GTS300 HPE SuperTech 66,000km
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Location: Batmania aka Melbourne, Australia
UTC quote
paws619 wrote:
Good morning! I have recently returned to scooters but have ridden motorcycles for over 40 years. I do a fair bit of long distance riding and tire pressure is often on my mind. Found this article online some time ago and wanted to share it here. https://americansporttouring.com/find-the-best-tire-pressure-for-your-motorcycle/
I love that this article stresses the point of tire temperature. I've seen way too much advice suggesting to check tire pressure when getting fuel ignore the significate temp change when during the ride there. I've commented several times about this before.

FYI the temp of the rear tire reaches 65C on a day ride on a Summer's day, that's way more than the start of the ride ...

PS, although they don't define what 'cold' is, I assume piaggio's numbers are for approx 20C.
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