Sk8 Gezu

Eu acrescentaria tirado do site da Bones:

ABEC VS. SKATE RATED™
“WHAT ABEC RATING ARE YOUR BEARINGS?”
We are often asked, “What ABEC rating are your bearings?” The answer is that “Bones Bearings are Skate Rated™ not ABEC rated.”

Bones Bearings are the skate industry leader and favorite choice of professional skaters, and have been since their development in 1983. During the past 26 years, Bones Swiss have become legendary because of their superior speed quality, and longevity. Even though Bones Swiss are the top rated bearing in skating, we don’t give them an ABEC rating. There is a good reason for this... thank you for asking.

The ABEC rating system has been around for the last 35 years. The purpose of the ABEC committee (Annular Bearing Engineers Committee) is not to test every manufacturer’s bearings and proclaim them good or bad, but to establish dimensions, tolerances, geometry, and noise standards for bearings in an attempt to aid industrial bearing manufacturers and users in the production, comparison and selection of bearings for general applications. However, since every bearing is used in a different manner and environment, bearings should be redesigned or “customized” for special uses (like skating). The ABEC rating system is not intended to be the only criteria used for selecting bearings for use in specialized applications like skating. It is only one of the tools a bearing designer can use if it is appropriate for the application.

The ABEC rating system includes grades 1,3,5,7, and 9. The higher the ABEC rating, the tighter the tolerances are, making the bearing a more precision part. High precision and small tolerances are required for bearings to function at very high RPM, in products like high speed routers that must spin at 20 to 30,000 RPM. In an application like this, an ABEC - 7 or 9 bearing rating may be appropriate. However, a skateboard with 54mm wheels turning 20,000 RPM will be traveling about 127 MPH! Since virtually all skating is done under 30 MPH, the realistic maximum RPM your skate bearings will see is about 4700 RPM and probably 90% of skating occurs under 2000 RPM. Thus, very high precision is not required at skating speeds.

The dimensions and tolerances controlled by the ABEC standards include the diameters and widths of the raceways, their shapes to some extent and the smoothness of the running surfaces. The ABEC rating system ignores side loading, impact resistance, materials selection and grade, appropriateness of lubrication, ball retainer type, grade of ball, the clearance between the balls and the races, installation requirements, and the need for maintenance and cleaning. All these bearing design requirements are very important to the performance of your skate bearing, even though the ABEC rating says nothing about them.

From our testing of bearings and our 26 years of experience designing bearings for skating, we know that there can be a HUGE difference between the performance of two bearings that both have the same ABEC rating. Indeed, we have found that in many cases, bearings with high ABEC ratings don’t perform as well as others with lower ABEC ratings in a skate wheel. Thus, reliance on ABEC ratings alone can lead skaters and dealers to choose a bad bearing for skating over a good bearing for skating. That is why we don’t use the ABEC rating system at all. In essence, the ABEC rating is irrelevant to the performance of a skate bearing when it is used as the sole criteria for selection.

To explain this another way, choosing an ABEC-7 or 9 bearing for skating would be like choosing an Indy car to race in the “Baja 500” because Indy cars can go fast and are of high precision. It isn’t that the Indy car isn’t a good piece of equipment, just that it is not designed for off road use and so it would quickly fail when its suspension breaks and its engine clogs with dirt.

Bones Bearings out perform all other bearings because we went to the trouble to skate rate Bones Swiss™ and Bones REDS™, not just select an ABEC rated industrial bearing and put a customized plastic shield on it. Bones have been completely redesigned for skating from the ground up and are built to Bones specifications that include Skate Rated components, lubricants, tolerances and clearances.

Bones Bearings component parts are engineered and tested to withstand the high impacts of hard landings, the high side loads of turning, and (to the extent possible) the dirt of skate environments. As a result, Bones roll faster and last longer than other bearings. To merely give Bones an ABEC rating would be to ignore all the improvements we have engineered into Bones and the resulting difference between Bones and standard ABEC rated bearings. Since there is no appropriate ABEC rating that will reflect the superior quality of Bones Bearings, we have given them their own rating, Skate Rating, to let you know that Bones Bearings are special and made just for skaters like you, not for electric motors.

GEORGE A. POWELL

"The ABEC scale is an industry accepted standard for the tolerances of a ball bearing. It was developed by the Annular Bearing Engineering Committee (ABEC) of the American Bearing Manufacturers Association (ABMA). There are five classes, going from widest tolerances to tightest: 1, 3, 5, 7, and 9. Higher ABEC classes provide better precision, efficiency,[citation needed] and greater speed capabilities, but does not make the components spin faster.[1] However, the ABEC rating does not specify many other critical factors, such as smoothness of the rolling contact surfaces, ball precision, and material quality.

There are no required materials in the ABEC grades. Bearings not conforming to at least ABEC 1 are not precision bearings."

Does ABEC affect the speed of your skates?
No. Not unless you are skating at 330 mph. That's based on a 608 bearing limiting speed of 32,000 rpm. Only in extremely high speed applications like ultra high speed motors and precision measuring instruments can bearings above ABEC 1 affect performance. Regardless of how fast you plan to go, speed is affected first and foremost by the choice of lubricant.

Pessoal tenham atenção aos rolamentos. vieram dos EUA..
Tem apenas 6 esferas... são os mais rápidos k existem, nem entram na categoria abec.
Aqui pelas descidas de sesimbra fizeram rondar os 100km\h...á pois é deu pra partir uns braços...

Gezu...
tenho mm k o despachar... por muita pena minha, mas o trabalho e o tempo n me deixam curtir umas descidas.

pernocas pena agora não poder! se não em monsantouiui! então com as kripto ficas parado ahh!
se tiveres atento! ve lá quantos correm na igsa com as kripto! eheheh
deves andar a ver filmes de downhill dos anos 90!
abraçinhos e mal possa vamos lá tirar teimas das rodas, arrancamos lado a lado sem dar ao pé! e vimos quem lá chega primeiro!
ehehehhehehehhe
assim se ve as rodas mais rapidas!
quanto ao raider és mais rapido isso não tenho duvidas!
sou maluco mas não sou burro

HAHAHA então temos corrida pedroné heheheh monsanto it´s on! lolol

só deixei aquelas rodas porque de facto em curvas largas e com speed, rodas com lábios sao de mais confiança, mas em velocidade acho que depende do asfalto...

kukumutxu não te livres da tabua e vêm mazé andar ca malta

Abraço

my friend!
não é bem assim!
tive uma igual!
tenho ainda uma modelo em carbono!
tenho essas rodas,e o que me referi caso nao entendes-te, foi que com aquelas rodas leva na pá! tanto ele como tu!!!!! se for contra alguem com umas bigzig ou orangtang! não tenhas duvidas!
se deste 80km acredito! mas com outras rodas davas mais! de certeza!
isso e um facto, as rodas kripto são maravilhosas mas são lentas.... bro!
nem discuto sobre a gezu sabes bem que admiro muito o criador o rider e as tabuas, tenho 2 ou 3 gezu
le tudo PERNES!
APENAS FALEI DO DESAFIO COM AQUELAS RODAS NÃO DA TABUA!
PERNES TU ANDAS ATÉ COM AS RODAS NOS PÉS! DAI SERES O MASTER PERNOCAS
MY BIG TEAM RIDER!
GEZU FOR EVER
E UMA BOA COMPRA SEM DUVIDA, NÃO FOI QUANTO A ISSO QUE ME REFERI!
ABRAÇOS

isso dizes tu Pedro hahaha!
Tenho que dar o meu parecer, afinal corro com a slimwavy desde a versão 1.0.
As rodas são optimas e já dei 80km/h com elas, são progressivas no drift quando se quer, e agarram nas curvas muita bem. Kryptonics 85mm Blue heavy stuff!

Os trucks são de muita precisão para dowhill, Randall 160 com bases para o efeito. Um pouco presos mas muito muito estáveis e rápidos, funcionam lindamente. O deck com uma lixa, bem aspera fica 5 estrelas.

A primeira parte deste filme na arrábida é exclusivamente com a slimwavy.
https://www.youtube.com/watch?v=2FtGe8tenQQ

Pedroné em 6 anos o material evolui, mas mesmo assim ainda levas ratada deste skate de 120€ face há tua full.ass de quase 400€ hahaha.

Resumindo, para quem quer uma tábua só para downhill esta poderá ser perfeitamente a Gun choice!

fixe!
mas com essas rodas( que são optimas,mas nao para speed) qualquer um de downhill passa por ele!

cuidado com esses desafios! em 3 ou 4 anos a modalidade evolui muito!
isso que até poderia ser um ferrari á uns anos agora já nã é!!!!!
abraço e boa venda!

Vendo Sk8 Lonboard gezu de downhill
com Rolamentos Bones swiss 6
trucks randal
rodas kriptonicks

Sk8 bastante sujo de oleo... mas desafio kk um a passar por ele. .
120€

dkskill@hotmail.com