GTS OWNERS CLUB

Maver · Posted: Tue Jan 06, 2009 10:50 pm Post subject:

.....and in the same vein, i recommend a 140 on the back instead of the 130 but keep the 120 on the front, i went to a 130 on the front and found it much harder to change direction quickly Wink

140 rear
120 front

just my opinion Cool

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Castle-Barber · Posted: Tue Jan 06, 2009 10:57 pm Post subject:

AIRMECH · Inspector Joined: 05 Jan 2008 Posts: 260

Innocenti · Posted: Wed Jan 07, 2009 6:29 pm Post subject:

ahhh the horses for courses i think the mallossi vaiator is crap compared to the polini one having had both and well tested both and being one of the first in UK to run the slider weights, i found the quality of mallossi was crap and had had it after 3000 miles were as i got 7000 out of polini before i sold it with no issues if fitted correctly with the grease supplied not a prob, then again it only takes one duff one from the factory and there doomed !!!!!! but when i had my armandos i can honestly say them twin carb kits are WERE SHIT !!!!!!!!!!!!!!!!!!!!!!!! Laughing

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smirnoff · Posted: Thu Jan 08, 2009 1:59 pm Post subject:

I had a Malossi variator fitted during the first service and MSC Sept 05 and it lasted a year before failing. The Polini runs on a greased and sealed slide and the Malossi runs on two bronze "self lubricating" but wearing slider, I had a Malossi bronze bushes wear out.
I've had my Polini on for two years now and 10K. Properly looked after and regularly maintained, and when it gets it's regular pre season overhaul it'll be re-greased and checked of wear again and I bet it will do at least another season. It seems there will allways favourites etc but it's like most things, if you want them to work well and last the look after them.
A question though is how many Polini runners run a Polini contrast spring too. The Malossi requires a contrast spring change so why doesn't the Polini, or does it. There is on listed on Polini's site and even PM didn't know when I ordered mine a year or so ago.
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PHIL....

richieboy · Sargeant Joined: 21 Jun 2007 Posts: 76 Location: Dumbarton

I think I'm now convinced that I don't need to change from standard, I can't be bothered with more problems.
That's why I don't ride a tuned PX anymore, the more you change, the more breaks eventually.
I'll make do with small screen, big rear tyre and LV exhaust.
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C'mon the Hoops!

Maver · Posted: Thu Jan 08, 2009 10:23 pm Post subject:

MikeHolland · Posted: Thu Jan 08, 2009 10:28 pm Post subject:

Fitting a larger tyre is rather like changing the final gear ratio. If it gives you more speed, does is also reduce acceleration?

I have nowhere that I could use more speed, so I am just asking out of curiosity.

Maybe I should be fitting a smaller rear tyre for better acceleration Smile

Mike
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Vespa GTS250 Vintage Red

Maver · Posted: Thu Jan 08, 2009 10:41 pm Post subject:

you would've thought that fitting a bigger tyre would've had a detrimental effect on acceleration but to be honest if it has i haven't noticed it.

as most of my riding is long slogs down the motorway the extra little bit of top end the 140 gives is well worth any loss in acceleration.

why not go for a 130/60-12?

same width, lower profile so would give equal (maybe better grip with the lower sidewall Question

) but smaller rolling diameter, should give better acceleration Cool

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rainham boy · Posted: Thu Jan 08, 2009 11:07 pm Post subject:

i have a standard belt and variator but fitted with 14gm sliders and there is no real diffarance to the polini variator i had on it before both with the 140 rear tyre
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Darkside, Norwich Broadsmen SC

Blackpool Paul · Posted: Fri Jan 09, 2009 12:24 pm Post subject:

As I understand it? its like putting the old 4.00x10 rear tyre on a Lammy, better top end, slight loss of acceleration, so a 140x70x12 on the rear of a GTS does just that? but a 130x60x12 would gain nothing top end or low down, but would be lower profile? so why not a 140x60x12? or am I getting confused? Rolling Eyes

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Maver · Posted: Fri Jan 09, 2009 3:13 pm Post subject:

130/70-12 is standard size

compared to standard size:-

130/60-12 is lower aspect ratio therefore smaller rolling dia therefore slight loss of top end slight gain in acceleration

140/60-12 would probably have the same rolling diameter as a 130/70-12 so only gain is slightly larger footprint.

140/70-12 is larger rolling diameter so slight loss in acceleration slight gain in top end, bigger footprint.

that's how i see it...........
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