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Does anyone know what the stock roller weight is for the new HPE 300 are? I have looked in the shop manual and owners manual but found nothing. Just trying to save taking mine apart and weighing one to find out. Thanks in advance.
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I just weighed my used ones from my Supertech and 13.8g. (after 13,500km. had flat spots)

Edit: See my next comment
⚠️ Last edited by SteelBytes on UTC; edited 2 times
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21x17 15.6 I think. Heavy so you don't over-rev the motor
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steelbytes wrote:
I just weighed my used ones from my Supertech and 13.8g.
This site says 14g. I must've worn my rollers more than I thought (or my kitchen scales are inaccurate) 🤷

https://www.scooter-center.com/en/roller-piaggio-21x17mm-14.0g-piaggio-300cc-hpe-vespa-gts-i.e.super-300-touring-300-supersport-300-supertech-300-2019-1pcs-cm294902

and so does this

https://www.vespaplanet.com/products/genuine-piaggio-roller-vespa-gts300-hpe-cm294902
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$13.80 is almost $14 if one is not being particular.

Wiki says 13.9g which again... https://modernvespa.com/forum/wiki-standard-roller-weights

12 would be Ok using the 85% practice.
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waspmike wrote:
pretty sure those wiki numbers are for the old gts not the hpe
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steelbytes wrote:
pretty sure those wiki numbers are for the old gts not the hpe
Not sure if you have the right info. It seems that there is no difference between any of the 300cc engines, as far as the roller weight...

https://www.scooterwest.com/hpe-consumable-kit-with-tools-for-belt-variator-valve-oil-service-6k-18k-30k-hpe-gts-super-gtv300.html

https://www.af1racing.com/OEM-Vespa-Belt-Rollers-Kit-GTS-GTV-300-HPE
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Burt37 wrote:
Not sure if you have the right info. It seems that there is no difference between any of the 300cc engines, as far as the roller weight...

https://www.scooterwest.com/hpe-consumable-kit-with-tools-for-belt-variator-valve-oil-service-6k-18k-30k-hpe-gts-super-gtv300.html

https://www.af1racing.com/OEM-Vespa-Belt-Rollers-Kit-GTS-GTV-300-HPE
Right back at ya 😝

https://www.sip-scootershop.com/en/product/variator-roll-piaggio-21x17-mm-14-0g_PI294920


And they also say for the old gts is 13.6g (different to the mv wiki)

https://www.sip-scootershop.com/en/product/variator-piaggio_PI144408
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steelbytes wrote:
Sorry, you are right... They are very different, especially the ones in your first link... Facepalm emoticon

PS...

Check the part number... ROFL emoticon
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Thanks everyone. It looks like the consensus is 14g. When I do the 600mile service I'll pull them out and weigh them to make sure.
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steelbytes wrote:
pretty sure those wiki numbers are for the old gts not the hpe
23,8hp at 8250 and 26 Nm at 5250 vs 21 hp at 7750 and 22,6@5000

So only 500 rpm at max hp by which time the variator has long since stopped acting and torque variation is at a difference of 250 rpm.

So essentially the same.

If OP wants stock then either Vespa parts at whatever weight they are between 13.6 and 14g. Or aftermarket at 13.5 or 14g. If he wants a bit more oomph during acceleration, say two-up or going uphill, then as said as low as 12g would also be OK. If Mike Holland chips in he also knows as he has two 300's. One HPE and one not.
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vespabrian wrote:
When I do the 600mile service I'll pull them out and weigh them to make sure.
Cheers.
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waspmike wrote:
If Mike Holland chips in he also knows as he has two 300's. One HPE and one not.
Not true. I have a blue 2015 GTS300 and a white 2018 GTS300. I took a GTS300 HPE for a test ride and was totally disappointed. Both my GTSs have Malossi V4 kits, Bitubo shocks and Brembo/Frando brake callipers, and they are far better rides than the standard HPE. One would have to spend a lot of money on an HPE to make it comparable.
I like 12.5 gram rollers in my scooters. Original were 13.9 grams.
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The most important tool is a tachometer, not digital scales. If you wish to choose one tool. Obviously if you are going to drill out your own weights then scales come in handy to check the result.

All weights vary slightly due to manufacturing. Buy a set of weights and even with decent scales, they will not all be the same. Quoted weight is the average of all 6.

In the real world during acceleration, which is what the weights are for, the difference between 13.6g and 14g is likely only about 250 rpm, if that. Constant speed rpm difference will not even be that much.

You need a difference of at least 1g to make any real-world difference. Say 500 rpm.
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waspmike wrote:
all and good but there has still got to be an official weight that the manufacturing is targeting.

like are you suggesting that all these websites are weighing the rollers themselves and sticking those numbers on their sites?
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And when someone gets this "official" weight. What is the purpose of knowing this? 13.6 or 13.8 or 14. I the real world they will all perform alike.

Why don't you buy an OEM set and weigh them? If that info is really important to you. But you have already weighed your old ones at 13.8g? That is close enough. There are no max/min specs in the manual!

Reminds me of how a drunk uses a lampost. More for support than illumination.
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steelbytes wrote:
Curious, did you personally weigh them with a set of scales that your trust?
The scales I used are precision ones, two bowls hanging on strings from a balance beam, and the set of metric weights that I used when at university. So yes, I trust them.
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waspmike wrote:
All weights vary slightly due to manufacturing. Buy a set of weights and even with decent scales, they will not all be the same. Quoted weight is the average of all 6.

I'm sorry, but that's not how I remember it. You are correct in stating that all weights do vary due to manufacturing process, but when they are picked and packed in the package they all are and have to be of the exact same weight. Otherwise, you would get vibrations in the same way you do when a spinning object is not balanced...

That's also why when mixing weights you still put them at 33 degrees from each other (or alternating the slots) to keep the variator balanced...
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Burt37 wrote:
I'm sorry, but that's not how I remember it. You are correct in stating that all weights do vary due to manufacturing process, but when they are picked and packed in the package they all are and have to be of the exact same weight. Otherwise, you would get vibrations in the same way you do when a spinning object is not balanced...

That's also why when mixing weights you still put them at 33 degrees from each other (or alternating the slots) to keep the variator balanced...
Fine if that is what you believe but is not my experience.
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waspmike wrote:
Fine if that is what you believe but is not my experience.
Are you saying that you purchased a brand new pack of 6 roller and they were not all the same weight?

What brand if you don't mind me asking?
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Sadly excel spreadsheets don't paste very well but here goes.

As I was drilling them out to get 12g from 14. I disassembled them into the plastic sheath and, in this case, the steel core. Steel is less dense and cheaper than brass which is also used on some weights.
I measure them by adding to the pile as I believe that to be the best way to reduce inaccuracy

2.2 then 4.4 the diff being 2.2g 11.9 then 24 etc. the 14 number being the total weight.

Plastic diff steel diff total
2.2 0 11.9 0 14.1
4.4 2.2 24 12.1 14.2
6.6 2.2 36.1 12 14.2
8.7 2.17 48.2 12.05 14.22
11.2 2.24 60.4 12.08 14.32
13.2 2.2 72.2 12.03 14.23

These are 14g Dr Pulley beige colour. I have some Tech pulley (no 12g available) but having drilled the Dr. Pulleys I am confident my calculations will be correct. Tech Pulley plastic sheath is lighter and the core is correspondingly heavier.

It is the RPM I want to achieve not the actual weight. So small differences don't matter to me.
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waspmike wrote:
Sadly excel spreadsheets don't paste very well but here goes.

As I was drilling them out to get 12g from 14. I disassembled them into the plastic sheath and, in this case, the steel core. Steel is less dense and cheaper than brass which is also used on some weights.
I measure them by adding to the pile as I believe that to be the best way to reduce inaccuracy

2.2 then 4.4 the diff being 2.2g 11.9 then 24 etc. the 14 number being the total weight.

Plastic diff steel diff total
2.2 0 11.9 0 14.1
4.4 2.2 24 12.1 14.2
6.6 2.2 36.1 12 14.2
8.7 2.17 48.2 12.05 14.22
11.2 2.24 60.4 12.08 14.32
13.2 2.2 72.2 12.03 14.23

These are 14g Dr Pulley beige colour. I have some Tech pulley (no 12g available) but having drilled the Dr. Pulleys I am confident my calculations will be correct. Tech Pulley plastic sheath is lighter and the core is correspondingly heavier.

It is the RPM I want to achieve not the actual weight. So small differences don't matter to me.
I was asking which brand you opened and found all six roller being different weight from each other..

I don't understand which pile are you referring too.. You should have only the roller in the package and check them individually, using a professional scale, and they should be all the same weight. I use Malossi and they were all the same weight per package...

I understand that you are drilling them to achieve a different weight, and that you don't care if your roller are of different weight, but that was not really the point...
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Burt37 wrote:
You should have only the roller in the package and check them individually, using a professional scale, and they should be all the same weight.
I took them all out of the packet disassembled them and weighed them. All within 0.1 - 0.2g of each other. How much more accurate do you think you need.

No such thing as professional scales. The scales don't know that an amateur is using them?
⚠️ Last edited by waspmike on UTC; edited 1 time
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Duplicate post
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waspmike wrote:
I took them all out of the packet disassembled them and weighed them. All within 0.1 - 0.2g of each other. How much more accurate do you think you need.

No such thing as professional scales. The scales don't know that an amateur is using them?
I don't need anything, in particular, but I got the picture now...

Thank you...
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Ok for those of you who are interested. I opened my new GTS HPE up today and weighed the rollers. The factory rollers are 14g on the new HPE.

Full disclosure I am NOT a professional but did use a professional scale.

Laughing emoticon
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