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| Speedboarding (19049 Posts)
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Speedboarding |
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ABEC Ratings
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On 11/1/2000
GBJ
wrote in from
(207.172.nnn.nnn)
Right on, Kurt. No matter how many times you tell 'em though, the marketing strategies of the skate-oriented industries will prevail. JON, you're sponsored by George Powell. Cool. A steady supply of reputable bearings is nothing to sneer at, but the conditions and figures cited by Kurt are accurate. ABEC ratings have VERY little (or nothing) to do with how a bearing will perform in a skateboard wheel.
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Info for KLUDY
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On 10/31/2000
Danny Connor
wrote in from
(152.163.nnn.nnn)
Hey KLUDY,
Dude, in review of the campo race video I've got, it looks like that fella who took you out didn't even hit a cone. The only cone I saw that was out of place was one that just looks like it got knocked down, but didn't even move from it's original spot. That's just what I see, it could be the camara angle or something, but you still got taken out no matter what. It could have been avoided on another rider's part, but oh well. Hey man, wasn't Sunday way too much fun? All I can do is give fair warning to the rest of the Amature field in the upcoming season of EDI. I will be gunning for fast racing, and maybe a gold metal, and I am not going to be dissapointed. I can't wait to bomb with you guys again!!
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bearing shmegmah!
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On 10/31/2000
Downhill Jimmy
wrote in from
(216.244.nnn.nnn)
My fastest bearing is 2 years old!
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Bearing info
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On 10/31/2000 Kurt
wrote in from
(63.232.nnn.nnn)
Sorry DT, I try to limit my posts here. Yes I plagiarized the site, no I don't know them. When I see an explosion of abec this and ceramic that I get a little suspect that the industry has succeeded in developing a brainwashing ray-gun and has it aimed at boarders. "BUY KRYPTON BEARINGS...GO FAST.."...........Sorry for the sarcasm..The point is, skate wheels will never see 5000 rpm on asphalt or hold together in a lab at 20,000 rpm and never ever see 40,000 rpm which is where the abec rating in these bearings will start to make a difference. Even so the difference is so small it is measured in watts which I think is about .00005 horse power or the amount of energy it takes to push a dead flea across a piece of glass. Once again I apologies for the extreme sarcasm.
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bearing info
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On 10/31/2000
DT
wrote in from
(24.4.nnn.nnn)
Kurt,
Did you get all your info off the minature bearings FAQ? are you related with them?
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WHEELSPIN/BEARINGS
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On 10/31/2000
JONWARBURTON
wrote in from
(213.123.nnn.nnn)
Sorry Kurt but I am fortunate enough to get sponsorship from Powell for their bearings, so in a way I actually remove funds from the manufacturer.
I realise that ceramics degrade quickly under vibration, that is why I bed them in at home and pass them on post race. I have to say that they DO work and the difference is obvious, almost tenable. How did you arrive at the figures you mention? Let me in on the formula!!!! Reading? thats a little town just west of London isnt it?
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Wheel spin / bearings
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On 10/31/2000 Kurt
wrote in from
(63.232.nnn.nnn)
The most noticeable result is that you will end up with less money in your wallet and the people that sold you the bearings will be eating out at restaurants at your expense for a few days. Under the following conditions, you may notice an improved performance.
(a) You spend a lot of money (i.e. thousands of dollars) to have your equipment (wheels and board) redesigned and manufactured to suit these high precision bearings. You will need to use some type of shock absorber that allows for absolutely no vibration.
(b) You will have to be prepared to skate on a perfectly smooth surface and make no attempts to use your feet to propel yourself. (Doing so would cause shock loads to the bearings and any extra precision would be lost very quickly).
(c) After you work out how you are going to achieve the above two criteria, you may (and that is only "may") experience a better result than using ABEC 1 bearings after you attain a speed of about 390 KPH (240 MPH) with 65mm wheels and grease lubrication.
Similar calculations for different wheel sizes and lubrication methods
52mm Wheels Grease Lubricated Bearings 310 kph (195 mph)
52mm Wheels Oil Lubricated Bearings 370 kph (230 mph)
65mm Wheels Grease Lubricated Bearings 390 kph (240 mph)
65mm Wheels Oil Lubricated Bearings 460 kph (290 mph)
70mm Wheels Grease Lubricated Bearings 420 kph (260 mph)
70mm Wheels Oil Lubricated Bearings 500 kph (310 mph)
Reading?
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Spinning wheels
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On 10/30/2000 Herbn
wrote in from
(216.107.nnn.nnn)
To a point, thats true, worn out would mean the races are no longer polished,loading the bearing will show it's slowness,but a nicely broken in swiss,or good abec 5 will spin quite long with little noise, and slow cosistantly,while a badly worn but still free spinning bearing should slow down at an uneven rate and once it slows stop quicker,than a new ,well spunout bearing.
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wheelspin
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On 10/30/2000
Jon Warburton
wrote in from
(213.123.nnn.nnn)
Woud anyone agree that the amount of time your wheels spin while unloaded has little or no bearing(geddit?) on how they would act when loaded (ie with your weight on them?) The oldest most worn out dry crappy bearings on earth will spin for ages compared to my powell swiss ceramics so long as they are not doing any work!! when riding however there is a marked difference!!
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Deja vu
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On 10/30/2000 Herbn
wrote in from
(216.107.nnn.nnn)
All over again, actually i'm glad to see others catching on,maybe the industry will pick up.The only problem with 8mm axles is if the axles are ever damaged,any burr(even rust) will jam up the precise fit between the axle and the bearing,and the bearing will be either stuck on or off the axle.Most people don't own a real file(nail files don't count)and fine sandpaper and they wouldn't know how to clean up a damaged axle to make things fit again,most trucks are not used only for downhilling.By the way,the upcoming bearing system by reflex may actually fix this inaccuracy by adapting 10mm bored bearings onto 5/16 axles.
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8mm axles for speed
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On 10/30/2000 Mario
wrote in from
(205.227.nnn.nnn)
I was switching around some trucks and wheels last night and made a discovery. Wheels will spin longer on Seismic trucks. I used the same washers on both trucks, so that is not it. I think it is because the Seismic axles are a true 8mm, whereas all other trucks are 5/16" (7.92mm). I think 608Z bearings are metric parts, made to be used with an 8mm axle. It is either this, or that the exposed threads somehow slow down the outer bearing (the Seismics are not threaded on the axle, but inside the axle).
Whatever the case, I have a set of Krypto Route 70s and they never seemed to spin very long, so I used to leave the nuts just a little loose. When I switched them Kryptos to the Seismics, I could tighten down the axle nuts all the way and they would spin longer than when loose on any other American truck. Conversely, when I moved my Aluminators from Seismics over to my Randals (or any other truck), they no longer spun as long as they did on the Seismics.
I don't think it matters for an everyday board, but if I were going for speed I'd figure out a way to replace the 5/16" axles on common trucks with 8mm unthreaded ones.
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adjustable flex deck
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On 10/29/2000 hc
wrote in from
(209.245.nnn.nnn)
check out this speedboard with the adjustable flex deck.
How does the flex adjust?
http://my.treeway.com/lobotomy/Home.htm?952824590
(look under the longboard section)
also check under the Moe Speed section. There is a longboard with moe speed trucks attached. It seem to have allow lower axle height compare to the Randles. Anybody ridden these on a longboard?
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Aerodynamics
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On 10/29/2000 Craig
wrote in from
(196.34.nnn.nnn)
Big ears are also a problem, but these things are not too much of an issue if you wear an aerodynamic racing helmet.
On the issue of weight: None of the guys I ride with are fat, we are all a bunch of skinny little s**ts. But I am the "heavy" one, weighing in at a mammoth 70kg!!! The lightest guy is about 55kg. The difference in speed when we race is stupid, even on fairly twisty courses...i don't scrub much speed in the corners, and then when we get on a straight, even over a short distance, once I break out of the pack, no one can stay in my draught!! This is not an equipment issue, and i think we all have fairly good tucks?
On the issue of weight, i have to say that it makes a bigger difference than i thought.
I must say though, Mikez, the light one, is getting faster the more we practice, but I'm still breaking away a lot faster than everyone.
Maybe this experiment of ours is inneffectual because we are all a bunch of lighties.
By the way Mike, i've hooked up with some Stand up people who are keen to skate (Dallas, kent, Biancha(the girl from the DHX), and a guy called Marlo)...oops, wrong forum, sorry
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Aerodynamics
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On 10/29/2000 Craig
wrote in from
(196.34.nnn.nnn)
If you have a big nose, be sure not to turn your head to the side when trying to go fast!
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muscle vs fat
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On 10/29/2000
Johngilmour
wrote in from
(63.214.nnn.nnn)
Yeah muscle is certainly faster. I used to race Nelson Vales in New York. He was a bike courier who was all muscle and went on to win the silver medal for biking sprint in the Olympics. 180lbs of muscle -mostly legs.
He couldn't handle huge speed though and wiped out so badly that his arms were white- but he is a black guy.
That wipeout with us in upsate New York drove him to cycling.
When I am in shape I weigh 175lbs, with a 29-30 inch waist. OUt of shape I'm 175 with a 34 inch waist. Shoulder diameter goes up a bit but everthing else seems to be more aero.
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WEIGHT
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On 10/29/2000
JONWARBURTON
wrote in from
(213.123.nnn.nnn)
HET DT; WHO ARE YOU CALLING FAT? I'M JUST BIG BONED. WATCH IT.....................
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Helmet
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On 10/28/2000
Chris S
wrote in from
(216.244.nnn.nnn)
Roger,
Talk to DT about his helmet. Seems to be a better setup Than a dirt bike helmet, but I don't think it cost him and arm and a leg.
Chris
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helmet needed
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On 10/27/2000
roger
wrote in from
(198.206.nnn.nnn)
My brother wants his dirt bike helmet back, it sucked for standup anyway (can't see where I am going). I need to get a helmet but do not have the deep pockets for custom aero ($800-$1200, yikes!).
Any recommendations?
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Weight
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On 10/27/2000
DT
wrote in from
(24.4.nnn.nnn)
2oolb rider: lean vs fat vs muscle
the guy with the most muscle will likely be faster than the lean guy which would be faster than the fat guy. Muscle is denser and would be a little more aero, also the guy with the muscle would proabally be able to hold a tighter tuck for a longer period of time.
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WEIGHT
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On 10/27/2000
JON WARBURTON
wrote in from
(213.123.nnn.nnn)
Beer guts such as my own can help,as the weight is stashed out of the wind profile. Being heavier will allow you to maintain your speed better over gliding secions, But will not give you better acceleration. I reccomend arriving at races not drunk, but seriously hung over.
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Ripped downhillers
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On 10/26/2000 Herbn
wrote in from
(216.107.nnn.nnn)
While the lean 200 lb skater would be somewhat lumpier,and the fat one would be smoother and rounder,his frontal area would be considerably larger.
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Weight
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On 10/25/2000 tn
wrote in from
(209.208.nnn.nnn)
I don't remember any of the first place winners and legends of yore like Hutson and Hickey being big boys. But if you got two people that weigh 200 lbs, all else is the same right down to technique, except one ride is 200 lbs of lard and the other 200 lbs with little fat, who do you think would put up more wind resistance?
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WEIGHT IN RACES
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On 10/25/2000 KLUDY
wrote in from
(64.12.nnn.nnn)
Weight will not be a player in a road that has lots of turns in it but on a big hill WITHOUT turns you will not drag race him to the line. The best way to go faster is to get behind him and let him pull you to the WIN.You will learn to pass the more you try. LATER GATER ------KL;UDY
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Weight
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On 10/25/2000 craig
wrote in from
(196.34.nnn.nnn)
Heh heh heh!
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weight
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On 10/25/2000 mikez
wrote in from
(196.2.nnn.nnn)
does anybody know how a persons weight affects his speed at all?
I top the charts at about 55 kg's. while skating today with a buddy of about 70 kg's. He is running randal compI trucks with all 76mm kryptos and some oldish bearings. While I am running rII's and two 76mm kryptos at the back and 2 cherry bombs in the front with reasonably new bones reds. and he was going a lot faster than me at first I thought maybe his tuck but I asked him what he thought and he said weight plays a big role in it.(our tucks are quite similiar)
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