Dr Pulley Sliding Roller vs Round Roller in variator 

Finally understood how it works. Thank you.

Anyone who thinks round "rollers" actually roll needs to ask themself which surface it rolls on. Because if it's rolling on one side then it's slipping backwards on the other side. The Dr Pulley sliders work better because they are designed to do what they do and the round ones are designed to do something that they don't actually do. The flat spot wear that developes on round "rollers" is proof of that. Whether or not the Dr Pulley design will actually improve the performance of your scooter depends on the weight you use, but they should definitely last longer.

Explanation and graphics are clear. Thanks.

Im using it on my race scooter. Its a very smooth operation and holds it rpm well

Thanks for the video 👍👍👍

150cc Gy6 here .. I bought 13 gram Dr Pulley Sliders .. Turns out my stock rollers weighed exactly the same 13 grams on a postal scale .. I did gain 3 mph top speed with the sliders. Everything on my scoot is stock except for the spark plug and the CDI. The RPMs did NOT change at Wide Open Throttle. They stayed the same as it was when the rollers were installed. I know all these gy6 scooters are different and get different results, but mine gained a few mph with 13gm sliders in place of the stock 13gm rollers. Both tests were at about 4 in the morning, no traffic or wind to interfere with the results.

These work great and the speed increase is very noticeable at first ride after the switch is made. THESE ARE THE SHIT!!! If you haven't upgraded, then I suggest you do so as soon as you can.

Thank you...🐝

Na een paar maanden met 28 gr rollen gereden, ik vond het toerental tussen de 60 km. en 80 km te hoog 5500 toeren, heb toen 30 gr besteld Erin gezet ik ben nu echt tevreden toeren bij 80 km is 4500 toert een stuk rustiger dank aan dr Pulley echte aanrader Bij bestellen dus eerst overleggen of sportief of touren

Hi, Alex Leier, thanks to your comment. We'd like to inform you Dr.Pulley will have a new SR (black color ) in the name of Black Pearl, its quality is better than previous IVORY color. Next time you can ask the scooter shop near you about this new SR, where're you located ?

very nice ilustration and explaination

Thanks.

Nice info sir, but how about gas consumption? Is it more efficient?

i just gone one set, i think i'm the first in Romania to have dr pulley! cant wait to try them :D

I was thinking of buying your sliders for my Yamaha Majesty 400 2006 model.. it's a bit sluggish of the line. But when I took it apart it already had them. One thing I noticed when taking it apart was that several of them were fitted wrong. I put them all in the right way and first few take of was amazing.. but now it's back to how it was before.. would they ve to worn when this happens?

It depends on how long of the rod, and how deep is the innerlock in the center of the pulley.

donde compraste lo polini y de que peso son??? gracias

link for the variator kit ? is it specially for the symphony st 200i?

Installed on 2020 xmax 250. Stock weights are 17 grams and i installed 17 grams dr pulleys. Its not faster on low speeds and revving 300 rpms higher on top speed. Tested with a different motorcycle before and after. Thinking about installing 18 grams but since its slower with same weights than original rounds its gonna be significantly slower on low speeds and rev the same as high speeds. I cant say its better than originals.. if i install 16 grams its gonna lose more top speed its already revving more with the same weights. If i install 18’s acceleration will drop. Whats your recommendation ? Should put stocks back? Thanks

Comprei o de 18G fiz todo procedimento de correia nova original, 0,5 e 1 mm desbastada, agora a moto só fica boa qd esta fria, esquentou, já era, trava em 80km

I have been using the Dr. Pulley 4.5 gram sliders in my 49cc scooter and, you do get a lower 1st gear and a higher 4th gear and much longer life than stock rollers. With out a doubt, it is not even close.

레이싱 롤러의 작동매커니즘에 대한 완벽한 영상~!!! 슈퍼울트라 땡큐배리머치!

i need to try those

what is the be5st roller weights for Skydrive125cc 13gx16gx13g or 13gx13g13g ? what is Better .. ?

Hi. If im using dr pulley sliding roller, need to mantain the roller size or get more weight?

請問有沒有出大兜風100用的規格 ，謝謝

I have a set in one of my 50cc Yamahas that have close to 15,000 miles on them. They still perform great, and look almost new. I went 20% lighter than the stock rollers. Much better take off and mid range, about 10% more top end.

Dr. Pulley ci sono per Yamaha X-Max 250 Anno 2010 ???

Nice

I heard a lot of good feedbacks about this dr. Pulley flyball that's why I'm looking for this brand of flyball that would fit or make my mio mx quicker acceleration but there's no available for older version of yamaha scooter like mio sporty and soul 115....

Hi will it hurt my stock gy6 c.v.t. if I ran 3. 9GM. Rollers in stead or 6. 4.5?

What roller for burgma 125 2016 is recommended?

Como posso compra pra honda lead 110cc

Thanks your comment.Hope you'll like the perfoemance and durability of Dr.Pulley SR and actually Dr.Pulley has round roller for OEM and OES.

Ottimo...

Tq info sir...

If its that good why the manufacters dont put them stock?

xe AB 125 2021 thì dùng bi bao nhiêu gam a ơi

Do they sell these pully for a Honda beat 150cc Philippines let me know thanks

Can I use both?

Good..... 🙏🙏🙏👉😎

My moto 150cc Should use sliding roller 12g 16g or 18g

that its big inovation and if the mechanic will know how to equilibrate the trasmition with that rolers your scooter will be beter ,this is pure machanic engineering very good product !!

heb ze op de juiste manier eringezet, geweldig een hele andere machine en in de top 150 km 1000 toeren minder. een echte aanrader

I remember experimenting with the honda variator who had grease in it... it worked verry smooth and adding thicker grease made it keep the rpm verry well and consistant !!

Does it increases torque??

its only for stock pulley?

Im running my 2014 yamaha zuma 125 with the stock 12g roller weights. If im looking for more botton end take off power which size rollers should i purchase? Somebody told me i should go with 10g rollers. Is that accurate?

After ~1000 miles since switching on my scoot (2012 Burgman 400) I have to say that I wish I'd done it sooner. Have found no downsides...around-town response is better, highway riding is much more relaxed.

I have nmax150 cc, I want to replace the roller of your product. what size of roller weight is suitable for nmax 150 .. thanks

Can you tell me which heavy-duty rollers would be ideal for the Yamaha X-Max 400cc scooter is 2018? Now it's 19g 25x15 original. tnx

is it increased mileage?

For a Hammerhead GTS 150 to be used on fairly steep hills what GRAM Sliders should i use? I'm unsure if heavier sliders/rollers means more torque or if lighter ones mean more torque i assume it would be LIGHTER to increase power to weight ratio but need clarification. P.S I'm a newb just started doing this research any assistance in improving my knowledge of such things will be appreciated!

Saya pasang loler dr.pulley di dua motor malah ngerusak rumah loler nya, di karna kan bantalan dalem nya koclak gak diem jadi ngegerus dingding rumah lolernya. Gimana solusinya nich? Apakah ada yang sama juga?

were can i get these in the uk for a import 125cc scooter??

o meu resolvi com ajuda do amigo no youtube

رائع

Los rodillos malossi de 22g aceleran más rápido que los rodillos bajados de peso a 22g de pulley ,estos últimos eliminan el corte de inyección por bajar las rpm pero no aceleran más rápido

Na olx custa a partir de 70,R$ o kit

will it work just as well with a stock variator?

Hello

I have a 2015 Yamaha tmax iron max, I purchased Dr pulley 16g plus sliders will get yamaha dealer to replace stock rollers at 10000km. If anyone else has done this modification did you get good results? Will post again after 500km with my experience.

Hi Dr :) do you know the roller size of Yamaha delight 115

Do you need to use the same weight as you do with rollers?

I am not knocking Dr. Pulley however if the correct rollers profile and pulley diameter/taper has been machined and the weights travel from min to max as intended then the items are correctly doing their job. A different ramp profile with appropriate weights would give a different result. If the original manufacturer wanted the original pulley to give a lower gear for take off and a higher top end gear they would have machined it to do that purpose. Also if you require a certain minimum belt speed to cause the centrifugal clutch to engage (this being at the rear pulley)then lowering your take off gearing may not help you achieve the required rear pulley RPM for clutch engagement at the offered lower speed. All of this however is also affected by the design and springs used in the clutch & I am well aware that Dr. Pulley offers a good range which I assume overcome this obstacle to performance. My point is with all the correct components you will achieve the desired outcome of the manufacturer. The idea of replacing rollers with sliders as the only thing you do simply changes what the original manufacturer designed into the components for performance etc. I am sure much testing goes into making matched components but myself would not advocate fitting unmatched or untried components together on the hope of a improved power/performance outcome. Also the sliders have a larger contact area and we have all seen the rollers wear flats onto them self, so wear evidence indicates the larger "flat" surface area should provide longer slider life over roller life. (This is just offered to consider when mixing together components of different manufacture.) Evidence indicates Dr. Pulley is a good product when all components used and also correctly matched together.

How if it doesn't sliding but rolling inside the pulley?

Hi man. Is the reason why the belt in the variator not riding higher at the top on WOT be because my slider is not heavy enough? I'm using 5g sliders at the momentno my stage6 vario and will still leave about 5-8mm on the sharpie marker. Got 1500rpm contra and 1000rpm clutch on the rear on a 792x16.6 belt. Take off is nice though.

اوك

Which is better the oval or the circle?

All you guys are under the misconception that the round "rollers" actually roll in operation. You've got a round object sandwiched between 2 flat surfaces. If it rolls on one side it would have to "roll" backwards on the other side. Since this isn't going to happen it ends up just sliding. Which is what Dr Pulley "rollers" do too, but they are specifically designed to do that, whereas round "rollers" aren't, which is why they always develop flat spots. They are both just sliding weights, but the Dr Pulleys are better designed sliding weights. Just because something is round doesn't mean it rolls.

if this dr pulley roller are really good why yamaha or honda kawasaki or suzuki scooter etc.they did not recomend to their motorcyle?comment please?

kalau untuk variobagus yg mana pake pully 125old.atau yg vario 150 yg bentuknya bulat tolong di jawab bang

Mau tanya Klo rumah roller selain gerak maju mundur, apakah dia muter jg gk?

i want to try it but the problem is the price for these in Indonesia are 200- 300% more than that of normal telfon rollers.

crezi tu, altii au de un an doi. eu am pus acum o luna

aku lihat admin DR pulley bisa bahasa Indonesia, mau tanya mas, aku baru ganti roller dr pulley di aerox 155 make yang 12gram, apakah normal ketika kecepatan 80 an kaya ada sesuatu yg nahan rpm.. tapi sebentar doang habis itu rpm nya naik lebih tinggi lagi...? makasih sebelumnya

I’m reading the comments in here I feel I have to leave mine. I’ve riding scouters for 20 years and just scooters for everything as I didn’t own a motorbike that I now do. I’ve done hundreds of thousands of km and never I had a scooter unmodified. I have tried every company there is for upgrade anything possible. My last scooter is a Vespa gts300 which has all the Malossi catalog added and goes really well with better 0-80 acceleration than a t-max530 my brother owns and top speed on tacho (which is very ambitious 150km ) What I want to say is that I had Malossi variator in my last Vespa lx150 also modified to 190 and I needed rollers every 3-5000km. Then in my gts I read and decided to try polini as everyone said is better with 9 rollers instead of 6. It was great from performance point of view but again new rollers in very short time and then after 20.000km my mechanic said it needed replacement as it became unsafe to ride with because it became loose. So I opted for the “best” option I could find the j.costa evo 3. Acceleration was better the bike was always ready to take off but after just 1000km 3 of the roller fingers or however they call them completely broke and the rest were in bad shape and the cost to change was very expensive for just 1000km. So my mechanic said let’s try stock variator with dr.pulleys. I wasn’t very excited but I’m always open in new things so I said I have nothing to loose. I have at least 95% of the j.costa evo3 performance with a fraction of the price and what about longevity. 32.000 enthusiastic km and they still look as good as new. I actually inspected them today and was sure I’ll have to replace them but no they are good at least for another service. I never ever heard a performance set of rollers lasting that much these sliders do and my mechanic puts them to every scooter that needs replacement with not one complain yet. Actually no one has yet managed to destroy them and asking for replacement. That to me sounds like a winner and I won’t look elsewhere anymore. That’s my point of view guys and you can learn something if you listen and save a few €€ by not making my mistakes.

Oh shit you are thinking aboutit.

We need for Benelli/Keeway Silverblade 250cc😢❤

if this product is that good, why is it not used by scooter racing teams??

can i get in india ? i have tvs jupiter.110cc

Our opinion to the question of " why yamaha or honda kawasaki or suzuki scooter etc. " is the cost of SR is higher than round roller. And actually Italy Piaggio did use SR as stock roller in GP800 of Gilera and SRV850 of Aprilia.

In Portuguese: Sem quere ofender ninguém. Sou do Brasil, sempre testei vários tipos de roller's.Semana retrasada chegaram os meus Dr Pulley 18x14.Instalei e andei por 2.000Km e posso afirmar com todas as letras, estes roller's são uma porcaria.Tudo bem que teve um ponto positivo: ficou mais linear, só! De resto, não valeu a pena...voltei a usar os roller's da Polini e posso afirmar que NÃO há comparações...Polini é muito melhor. Para os que nunca usaram, façam seus testes e verão.

Buat Yamaha Fino Fi 115cc 2014 gak ada ya?

Круглые ролики катятся по вариатору и вовремя просаживаются на место,потому что у них пятно контакта меньше,а полигональные тащатся поповерхности и с завидным постоянством заедают в самый неподходящий момент.

I just install these Dr. Pulley 14g yesterday, a replacement from 15g stock on my Yamaha Majesty. Didn't see much of differences, except RPM are now much higher during cruising (700-1k). Engine run hotter, losing top speed and also degrade accelerating for passing. Removed and put back stock. What a waste of $55.

nge gesek lama kelamaan abis bro...

Dr. pulley increases your maintenance cost. Sliding friction is more than rolling friction..

my mechanic gave a big no to these kinds of mods. said piaggio was well engineered and doing this stuff would ultimately be detrimental.

S

From maximun 125km/h to 133km/h with 15 gram roller on 150cc scooter

Light rollers get less speed and stronger. Heavy rollers, higher speed on the road.

Indonesian language please

No diff

Kulo mboten mudeng seng di rembuk wong2 boso Inggris tok.

LOOK AT THE ROLLER DEMONSTRATION!!! "Round Roller in high position" and "Sliding Roller in high position" has a different Rollers house shape, so the ROUND ROLLER LOOKS LOWER and a SLIDING ROLLER LOOKS LIFT FURTHER. It's not not fair...... WTF

Mga Lods, may nakagamit na ba nito? Kamusta performance? 🇵🇭😅

Without want to offend anyone. I'm from Brazil, I always tested several types of roller 's.Week before last showed my Dr Pulley 18 x 14.Installed and I walked 2,000 Miles and I can say with all the letters, these roller's are crap.Okay that was a positive point: became more linear, just! Moreover, it wasn't worth it ... I use the roller Polini's and I can say that there are no comparisons.Polini is much better. For those who have never used, do your tests and summer.

Ĺ

i have no see any difference with that type of rollers.... Same top speed and same acceleration.