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| Truck Reviews (15215 Posts)
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Jim Z's
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On 6/16/2005
TK
wrote in from
United States
(66.30.nnn.nnn)
Pierre, put me down for a set of Jims 100mm Slalom Speed Trucks 50* and 35* base plates please. TK
PS when are youi guys coming down again. We are having a race in Gloucester Ma next weekend.
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Where to find JimZ hangers?
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On 6/16/2005
pierre
wrote in from
Canada
(24.200.nnn.nnn)
Ian from the UK asked where he can find JimZ Hangers, Jim got his website for speedparts
http://www.speedparts.ca/
Here's more accurate photo by the way:
And to Paul Howard asking about JimZ baseplate, jim's got a prototype baseplate going but his hangers fit perfectly on Randal baseplates, (both RI and RII) and his kit comes with Grade 8 kingpin and a better and machined pivot cup, washers and his superb speed bushings. Some JimZ Slalom Trucks may show up someday too!
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RADIKAL
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On 6/16/2005
Miss Kitty
wrote in from
United States
(65.41.nnn.nnn)
If you have any problems reaching Sparky, you can always call our toll free number 1-877-RADSK8R (1-877-723-7587) and I will be more than glad to help you.
MISS KITTY
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Radikal
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On 6/16/2005 Sparky
wrote in from
United States
(12.78.nnn.nnn)
Thank you Bobby I could not have said it better
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Radikal Spherical bearings
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On 6/16/2005 Sparky
wrote in from
United States
(12.78.nnn.nnn)
The kingpin sleeve in the base plates on the Radikal trucks have been changed so that the threads on the kingpin go below the surface .175 inch. This change was made after the worlds.
The only kingpins that have broken were in trucks sold before that race.
Radikal has been replacing all kingpin sleeves (FREE OF CHARGE) for anyone who has trucks from before the worlds.
If you have a truck from before the worlds and you have not had your kingpin sleeve replaced just call sparky at 561-818-0625 and I will change it or send you a new kingpin sleeve so that you can change it.
because the Radikal truck uses spherical bearings there is a limit to how far you can turn from side to side before the kingpin makes contact with the hanger and outer race of the bearing. If you are over steering and the kingpin contacts the aluminum hanger and/or outer race and you keep turning harder and harder you are bending the kingpin from side to side this will cause the kingpin to snap off (on the old style trucks with no sleeve and the early sleeves)
There have been "NO" kingpins break with the new sleeves
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RADIKAL -Kingpin
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On 6/16/2005
Bobby Mandarino
wrote in from
United States
(68.204.nnn.nnn)
I know there have been some kingpins which have broken on the older Radikal trucks. I have been riding the newer generations since the begining '03. I am a larger racer and have never broken a kingpin, old or new. I do not ride my setups around town or just crusing. I treat them like a "race" truck and do not seem to have any problems. Although they turn great, there is a limit to which the truck can turn before you bottom the hanger and start torquing the kingpin. I do not know of a race course where this would ever happen. Staying on top of your equipment (tightening, cleaning, lube) and using them for their design purpose should keep you trouble. Orginal Independent suspension trucks held up great for me too. Anyone can trash anything. Treat your race equipment as race equipment.
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More of the Same Thing
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On 6/15/2005 Same Guy as before Wax's entry
wrote in from
United States
(64.5.nnn.nnn)
Hey Wax, Good working pragmatic observation of a similar problem, different application. Thanks-Paul
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Pauiwogs theory of spherical realativity
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On 6/15/2005 WAX
wrote in from
United States
(24.9.nnn.nnn)
First and foremost...I am not a structual engineer, but I play one everyday at work...
from my experience...on a machine that cycles about 3300 times a day (Each cycle would be one upward thrust, and one downward)with a load of 36 pounds and a lifting force of about 1500 pounds per stroke...we were having grade 8 3/8 bolts shear at the threads, just below the tie-rod end (spherical bearing) about every 2 months...the threads came up to just below where the bearing met the interface of the base that the bolt penetrated...
at the suggestion of my machinist...(the guy who helps me do all the DragonSlayers) we bored a hole into the plate about .001 bigger than the diameter of the non threaded shank of the bolt that penetrated .75 into the plate that the bolt threaded into.(Its 1.5 inches thick)..
that was late 2003, and I have not had to replace a broken bolt yet, although after all this madness, and remembering how fun it was to remove a broken grade 8 stub I will do it Monday after I return from the US Grand Prix...
My personal opinion ...yes I understand Opinions are like a$$holes, everybodys got one (and some people are a$$holes)if you were to use a spherical bearing to tighten the interface between the hangar and the kingpin and the threads of the kingpin were not well below the point of force absorbtion, then you would have skaters on their faces testing the durability of their full face helmets...thats why I use a minimum of 2.75 inch grade 8 kingpins on all my SplitFire DragonSlayers that I ride, as well as my Randalls, as it puts the threads well below the baseplates kingpin interface...
Just my 2 cents worth, I probably dont know s#@!, but its my responsibility to keep all sorts of machines that go thru repetitive duty cycles opperating so we can keep puttin out beer in packages and I spend as much time with a wrench in my hand in 1 week than most racers do in 5 years...
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JimZ's Hangers
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On 6/15/2005
Paul Howard
wrote in from
United States
(64.5.nnn.nnn)
Chris (of the Chaput sort), Thanks for the pictures and feedback. Interesting design, I think I remember them from something in Concrete Wave. I assume that the JimZ's hangers go into a JimZ's baseplate as well (as opposed to fitting a Radikal or Randall baseplate)? Yes, if those trucks hold up racing "The Bear" that does say a lot about them. If both have a sherical bearing interface with the kinpin, then that either: (a) debunks my theory and I'll have to settle for the null hypothesis, or (b) there is another element at hand like kingpin threading placement or precision of the geometry so pivot points do or don't bear a portion of the weight and do or don't take some of the load off of the kingpin differently between the Radikal and a JimZ's truck. I'll gladly accept option "a", though I'd be curious about option "b" as well. Thanks-Paul
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Fury
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On 6/15/2005
Mercury
wrote in from
United States
(208.59.nnn.nnn)
OK.
Yo, Rune! Where you at?
I need some Evos without axles, or at least with only pressed-in axles.
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Furys
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On 6/15/2005 Smokestack
wrote in from
United Kingdom
(81.156.nnn.nnn)
As I said they just one offs. They may well be Chicken's components but I'm not sure. They're based on Evo's - light and strong. They came out of Fury and not from Chicken, but I'll ask him if he put them together. I think they were made over a year ago but I only just got them.
Fury actually make some non-production trucks for their team riders. Their Evo 8.5" is excellent but not available. Ask Rune!
BTW - Fury have no website or direct contact.
I'll let you know how they run when I can be arsed to put them on a board.
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JimZ trucks
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On 6/15/2005 Ian
wrote in from
United Kingdom
(80.177.nnn.nnn)
They look good but where can you get them from?
Ian
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Fury
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On 6/14/2005 Mercury
wrote in from
United States
(208.59.nnn.nnn)
Please post up some Fury contact info, a web page, or something. I have never been able to find any info for that truck company.
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Fury?
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On 6/14/2005
Geezer-X
wrote in from
United States
(141.156.nnn.nnn)
So you're saying Fury does the Pocket Pistols offsets?
'Cause that offset and the axle in the front look just the PPS stuff...
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Jim Z's
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On 6/14/2005 TK
wrote in from
United States
(66.30.nnn.nnn)
Jim Z's Slalom Trucks are unreal.
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Furys
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On 6/14/2005 ???????
wrote in from
United Kingdom
(81.156.nnn.nnn)
They're just a one off set that Fury re-engineered for me! Cool!
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Furys
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On 6/14/2005 Mercury
wrote in from
United States
(208.59.nnn.nnn)
Wow, Supelight! What Furys did those start off as?
Did they have cast-in axles? If so, how did you remove them?
Did they come with the 2.5" hole pattern or did you add that yourself?
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Furys
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On 6/14/2005 Supelight
wrote in from
United Kingdom
(81.156.nnn.nnn)
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spherical rod ends
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On 6/14/2005
FL
wrote in from
United States
(65.249.nnn.nnn)
Just about every mfr. of rod end bearings has an unthreaded shank model . Aurora , Heim and R.K. ,etc. will make a rod end to your spec if the standard sizes don't suit your needs...FL
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JimZ Hangers
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On 6/14/2005
Chris Chaput
wrote in from
United States
(66.116.nnn.nnn)
The axle is clamped firmly in place.
One of the challenges in making trucks, especially those with wide hangers, is to get a long, straight axle into them. It is difficult and/or time consuming and/or expensive to try and drill a long hole through material and have it come out straight on the other side. Sometimes you have to drill a smaller hole from both sides and hope that they are "close" in the middle, then go back and ream out the hole to a finished size. Then you have to figure out how to hold the axle in place. Inexpensive trucks that don't require any real precision just cast the hangers with the axles in position.
The more precision machining that is done, the more you'd expect to pay. JimZ's aren't cheap, but you'd appreciate the quality. It's easier to machine two straight semicircular grooves than it is to drill a long hole, and this design also provides a solution for fixing a spherical bearing and a pivot pin into the assembly.
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Jimz Hangers
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On 6/14/2005
Fitz
wrote in from
Australia
(203.164.nnn.nnn)
Wondering if anyone out there knows.
When the hanger is assembled ready for use, is there any clearance between the axle and its channel? Basicly can the axle move freely or is it clamped into position.
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Ask Jim Ziemlanski
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On 6/11/2005
Chris Chaput
wrote in from
United States
(66.116.nnn.nnn)
Paul, If what you're suggesting is true, than JimZ's trucks would be snapping kingpins. He has spherical bearings in the hanger and he uses grade-8 kingpins through the bottom of his baseplates. Ask him what his failure rate is with regard to kingpins. I haven't heard of any problems. He used those trucks in the ABQ banked slalom races at Indian School and the Bear. He podiumed in both.
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Radikal Hanger/kingpin Bearing Deep Thoughts
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On 6/11/2005
Paul Howard
wrote in from
United States
(64.5.nnn.nnn)
Hey, if I had to guess what is the single most likely factor in Radikal kingpin breakage it would be the fact that the kingpin/hanger interface is so tight and exact it does not really allow any verical axis movement or fore/aft variation. If the hanger is not coming STRAIGHT out of the pivot EXACTLY 90 DEGREEES RELATIVE TO THE KINGPIN it will leave a small but cruicial gap between the pivot pin of the hanger and it's weight bearing resting point in the spherical bearing the pivot pin sits in. If there is no gap, then a good portion of the weight is on the pivot and reducing the stress on the kingpin. If there is any gap at all, then ALL the vertical stress load is on the kinpin ALONE, plus the normal side loads spells a lot of stress for a 3/8" piece of steel. This situation will occur any time that the bottom bushing is too tall or too short, or the lock nut is tightened down too far changing the angle of the hanger relative to the kinpin and eliminating the proper fitting of the parts. This could simply occur from compaction of the bottom bushing from the rider's weight and/or pumping around a cone. OK, so I've detailed what many of you have already brought up.
POSSIBLE BEARING SOLUTION: Instead of using a circular bearing in the hanger/kinpin interface, use one that is oval shaped with a vertical slot/gap allowing for some fore/aft movement of the hanger that won't add vertical stresses onto the kingpin. This would still restrict side to side movement and eliminate the slop of side to side movement(slop) of a conventional truck without such a bearing. It also may increase the vertical load on the pivot pin in a bad way(I'd be curious to hear someone's thoughts on this like McCree or Sparky or really anyone). This may however be a hardware version of "Unnobtainium" for several reasons, such as #1-the bearing currently used is an industrial off the shelf bearing and what I propose may not exist and, #2 If Sparky is making the current bearing on a lathe, the oblong oval slot-bearing does not lend itself to easy manufacturing.
Adios-Paul
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good or bad?
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On 6/11/2005 Marcus
wrote in from
Sweden
(81.225.nnn.nnn)
After reading all these posts I figured it could be worth checking my 2 front Radikals. And what I found was that the baseplate seems to be of 2 different kinds. One has threads all the way up whilst the other have about 3 mm of unthreaded support for the kingpin. Is the one with threads all the way one of these old generations that should be sent back, or is this just generation 2 and the one with extra support generation 3?
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QUESTION:Broken kingpins on OTHER trucks - Slaloming
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On 6/10/2005
Paul Howard
wrote in from
United States
(67.171.nnn.nnn)
As a rider of modified RT-X's in front and Splitfires with an RT-X baseplates in back and occasionally a Seismic in back, I've changed almost all of my stock kingpins in the Tracker baseplates to longer grade 8 3/8" bolts from the local hardware store and I ride really loose by most people's standards, do a LOT of small slope (and occasionally flat), hard-pumping T/S with my front truck pretty steeply pos wedged and the back slightly neg wedged. I weigh 165-ish. I have not YET broken a kingpin or TTC/Splitfire pivot screw/bolt but those are always at the back of my mind (that's why I always slalom with the shiny silver jacket).
I've recently acquired a used and for a good price Radikal Front for T/S and it feels pretty dang good. Excellent, in fact. I also like it best with the same steep pos wedge. I also cut a Radikal clear bushing to a narrower diameter and put it next to the baseplate, and a diameter-trimmed full height yellow Stim at the nut end of the kingpin for that "extra-squirrely" feel I like. I have been very careful to maintain that 90 degree angle of the hanger to the kingpin as I immediately understood the danger of tightening the nut too much and stressing the kingpin from that aspect and keeping some "pre-loading" on the bushings so they're not floating loose either. The first thing I thought of when I took it apart to look at it was that the hanger/kingpin interface bearing is responsible for the good precise feel, but the kingpin is probably silently screaming at each cone under the more direct stress load from the hanger bearing. I also wondered in the past about the old Gullwing split axle and it's kingpin reenforcement safety bracket. I'll have to look at the threading placement next time I take the kingpin out. I'll admit it, I'm a 4.5'- 5.0' center to center fag of the worst kind, whatever, it's good training like a speed-bag in boxing. From the run of this recent forum it sounds like I'm pushing my luck with the courses, squishy bushings, and steep pos wedge. Anybody want to respond any more to these issues? It sounds like I'm doing all the "Do Not's"
MY REAL QUESTIONS ARE THESE: Has anyone out there broken a KINGPIN on an RT-X, RT-S, TTC, Splitfire, Airflow OS, or Indy/Indy Offset, or Seismic whilst slaloming? Also has anyone broken the PIVOT SCREW on a TTC/Splitfire/Airflow or the PIVOT on an RT-X or RT-S hanger? You can respond here or to bird041167@yahoo.com . Thanks-Paul
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