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| Truck Reviews (15215 Posts)
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Machinist
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On 4/2/2007
jimz
wrote in from
Canada
(64.251.nnn.nnn)
Machinist, do you have an email I can contact you at?
Jim
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Spherical Bearing
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On 4/2/2007 The Machinist
wrote in from
Canada
(24.71.nnn.nnn)
Non Biased Opinion:
Spherical bearings do not have to be heavy or expensive, I know that Jim Z's cost around $17 CAD a peice and rust easily. There are alternatives such as high performance polymers (than dont require a custom sleeve pressed into the bearing like a jim Z) they are around 3 dollars a peice light weight, and strong enough, self lubricating. Overall a better product overall, cheaper, corrosion resistant, better for everyone.
As far as how they work in downhill trucks i think depends allot on bushings and pivot cups, unless you use a big soft bushing (like a jim Z) and a soft pivot cup i think the vibrations can affect you in downhill on rougher pavement, but they do turn consistantly...ive had randals get caught over to one side after a hard slide before, and seen marks on the king pin through hole in the hangers from king pins hitting the hanger...Maybe a floating spherical bearing held in the hanger by the bushings would be a good idea so it can move up and down the king pin a bit but the vibrations arnt taken by the race of the bearing or the shoulder the bearing is pressed against but the bushings.
The Machinist
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New Originals
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On 3/29/2007 Chris Yandall
wrote in from
United States
(75.80.nnn.nnn)
Scott informed me recently of a new push for the updated Original Truck.
more news coming on that...
Tracker has a surprise coming too :)
Sector 9 has a truck called the gullwing sidewinders that are not sold seperate from the board(yet?). they come preinstalled on sector 9s only.... i demo'd. feels like a nice nice ride :) lots of cranking angle and yet stable at lower speeds. didnt have a hill for higher speeds but damnnnnnn they felt sweet!
cYa
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FUKTRUX
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On 3/29/2007
donald20
wrote in from
Germany
(88.76.nnn.nnn)
100% american
made by the right folks
FUKTRUX
nothing else matters
skip the discussion and go for those....
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Seismic stable?
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On 3/28/2007
nateisgreat9
wrote in from
United States
(131.191.nnn.nnn)
I was wondering if the stable turning seismics were a good idea to put on a downhill board. Because I know all about the Grizzly's, the Randal DH, and the JimZ's. But does anyone think that the Seismics could with stand 40 mph or 35mph turn/slide.
-Thanks
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tracker fasttrack?
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On 3/28/2007
cam
wrote in from
Australia
(220.233.nnn.nnn)
has anyone heard of the new tracker fast track coming out soon. it is in an ad for it in the concrete buyers guide.
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Ball joints/spherical bearings
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On 3/27/2007 herbn
wrote in from
United States
(205.188.nnn.nnn)
not a big fan, they're metal,steel.heavy,and i'm pretty sure metal ball joints need lube to pivot well and to reduce or cushion play, they're made with clearence,so the metal isn't grinding into itself, let them run dry and they grind and gain more play. Lube in the ball joint that is between the bushings ,is sort of a conflict to me. Urithane bushing to snap nicely to center should be dry so the edges of the bushing sit firmly in the bushing seat area of the hanger,lube in this area lets the bushing sqish to the side and not reallly snap quick to center. I also think the distance between the upper and lower bushing should be minimal, the material that the hanger is made of needs to be strong enough to not crack at the edges of the bushings,with loose shallow geometry dh trucks that you can run nice and loose stresses on all the parts is reduced a bit. I like delrin sleeves on either side of the bushings, with a split axle very slightly offset ,but right at bushing level,delrin sleeves are light,can be made to snugly fit metal parts(no play) and they are pretty much self lubing, although if you coat parts with a bit of light grease it sort of gets absorbed,and lubes things.
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classes
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On 3/27/2007 hc
wrote in from
United States
(71.139.nnn.nnn)
mechanical engineering, materials, machining, drafting class (of course basic physics) (I slept through a lot of these classes ;-) )
there are of course many great designers with no formal training too, experience and creative thinking can go very far.
Just one tip, don't tell your parents that you are going to college to design skateboard trucks...
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thanks
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On 3/27/2007
Sam of NY
wrote in from
United States
(68.193.nnn.nnn)
Thanks that really helps alot!
What type of class would one take to learn how to applie truck design? An engineering/metal working course? - it justs interests me is all.
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rake and spherical
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On 3/26/2007 hc
wrote in from
United States
(71.139.nnn.nnn)
sam, rake is axle offset from the pivot axis.
(see this diagram by pvd)
http://www.geocities.com/sk8sanjose/geometrypvd.jpg
spherical bearings are used at the pivot and/or the bushing seat area.
prevents binding, friction, 'hanger slop', etc. I think all the design out there puts load on the bottom bushing like a traditional truck (except chaput's I believe)
http://www.asphaltplayground.com/trucks.html
I think the jury is still out whether they are needed for downhill. I haven't had a chance to test them out, but some people have said they are too jittery for speed. I would like to see more non biased speed truck reviews on here....
They are popular for slalom, where quick turning is desired.
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Rake + Spherical bearing = oblivious to my understanding
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On 3/26/2007
Sam of NY
wrote in from
United States
(68.193.nnn.nnn)
I really feel like a noobie asking this but I'm going to do it anyway.
Could someone explain what a rake is on a truck and where a spherical bearing is located and how it works and what it does. How do these things applie to the function and effectiveness of a DH truck.
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grindking axl
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On 3/26/2007 hc
wrote in from
United States
(71.139.nnn.nnn)
i ran across their ad in transworld (i think)
surprised to see an ad with technical details...
(see the ad here)
http://www.grindking.com/
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paris truck
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On 3/26/2007
Adam
wrote in from
United States
(198.144.nnn.nnn)
Wow.. that design sure looks familiar. Even comes in familiar 150 and 180 widths!
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paris truck
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On 3/26/2007 hc
wrote in from
United States
(71.139.nnn.nnn)
saw this also while over at sf
http://www.paristruckco.com/
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fuktrux
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On 3/26/2007 hc
wrote in from
United States
(71.139.nnn.nnn)
wax, just checked them out on sf (why no pics here?)
looks cool, pretty beefy looking..
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High end speed trucks
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On 3/26/2007
Pierre Gravel
wrote in from
Canada
(24.203.nnn.nnn)
Or check the JimZ Speed trucks, the original high precision downhill truck.
It's been on every speedboarding podium since it's release.
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Trux
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On 3/26/2007
WAX
wrote in from
United States
(67.164.nnn.nnn)
Check out the FUKTRUX on the other site too
Quality USA made precision, All USA parts, Lower and the same high quality 8MM axle material as the SplitFire...
Several sets have been thru some long runs over 50mph, and the riders are stoked...
Available with or without bearings in the hangar...
180 and 200mm
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kahalani
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On 3/25/2007
hc
wrote in from
United States
(71.139.nnn.nnn)
I checked out the write-up on silverfish,
I like the fact that they are lower, no need for drop thru decks.
they should list the height (baseplate to axle)
I guess these don't use any spherical joints?
$275 + $50 shipping to US, is a lot of dough though...
but then so are all the other ones..
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kahalani trucks
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On 3/25/2007 Peter
wrote in from
Sweden
(85.226.nnn.nnn)
Iäve been looking for the trucks since your post luis and finally they are available to order onlie! check out www.kahalani.se for more info!
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Roger That PSR!!
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On 3/16/2007 Bob Frias
wrote in from
United States
(69.143.nnn.nnn)
The venerable Fultrack is still the best truck ever made IMHO.
Geez is working mine right now and while I am getting 8MM axles in my front small pivot, it was still straight and it was a threaded version.
I have several sets of 70's Trackers and they are all straight and true. But then again so are my split axles and my Rebounds.
Oh well, at least my small pivots are up to date, if not a little stronger.
Bob
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Neat production ideals
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On 3/15/2007 PSR
wrote in from
United States
(75.69.nnn.nnn)
Yeah, I got that, Herbn...
Funny how some trucks come with this or that bit-part-idea-axle item that would lead you to believe the Future has finally arrived. Then I get on my '75 Tracker Fulltracks, or my Bennett Hi-Jackers, and I wonder, how could we have gone so little in so much time??
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oh yeah
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On 3/15/2007 herbn
wrote in from
United States
(152.163.nnn.nnn)
i didn't mean i thought tensors were good dh trucks or even that a wider version would be cool for DH carving longboarding, just if accurate impressions could be made for the parts and thicker accurate machined down axles were cast in, things might end up pretty straight on a randal style geometry truck.
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affordable quality
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On 3/15/2007 herbn
wrote in from
United States
(152.163.nnn.nnn)
as far as i know the new tensors are supposed to to be fairly accurate,CNC'd original pieces that make the impressions,the only downside is the old style axles cast in(yuk)i think cast in thick axles may be the way to go, i think 10mm,may be thick enough to stay straight.Diecasting the baseplates would probabely be cool,put the pivot and kingpin holes in with a cnc.
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Thanks!
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On 3/15/2007
Nick
wrote in from
United States
(70.161.nnn.nnn)
Thanks guys, you've really helped me out! I really appreciate it.
Nick
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Revenge torsion/ Seismic question
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On 3/14/2007 Pre-School Rider
wrote in from
United States
(75.69.nnn.nnn)
Nick, this is something I dug outa the old archives here by using the "search" function. I posted it originally almost two years back. It might help you understand why I like Seismics in certain applications. I've owned a pair since '94 (still in constant use,btw), and can vouch their good trucks; unique in some ways, but good nonetheless.
On 5/13/2005 PSR wrote in from 69.161.xxx.xxx:
Airin, definately go with softer springs to get a looser,'surfy' feel. Keep in mind that as you put some hours in on these trucks, you'll get to where you can 'press' the springs into deeper turns even when they're tighter than you'd like. It took me awhile to understand that, but once I figured out that my body was often reacting to re-center a 'normal' truck, instead of putting muscle Into the turn, and Letting the truck find the return-to-center, That's when I was unequivically Sold on seismics.
In board flex, flex along the length is cool (I have a high-cambered Bozi G.S. 36" that loves having seismics on it!), but be sure the board dosen't 'twist' torsionally too much. Also consider truck and deck width. Having the trucks a tad narrower than the deck is a Good Thing with seismics, so maybe 150mm hangers and Fat wheels, or use center-set wheels on the 180mm hangers.
Wedging works Very directly on seismics. Khiro's new wedge package would be a good buy if you want to play with turn size,turn reactiveness,or adding stability without changing the wheelbase length.
Take the time to dial these trucks in. The set-screw adjustments are very accurate, and sensitive. The Spring concept itself takes awhile to adjust to, as does the very fact that all four corners can be individually tuned to a different setting. The trucks are as lively as your feet are quick. They are as stable as your feet are grounded. And the steering is as quick as the geometry you wedge them at. Get it sorted out, and you're lovin' it. If you're not willing to let this truck work for you, then you'll miss out.
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