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Quad Roller Skating Forum Discussions about quad roller skates and any other quad skating discussions that do not seem appropriate for one of our other forums.

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Old December 20th, 2017, 11:29 PM   #1
fierocious1
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Default Broken KING PINS and TRUCKS

I know some of you have broken kingpins. The question is, what type of quad skate did you break or bend one on?

DA45 45 or 30 degree kingpin
OR
Other

If you broke a truck in half at the cushions, same question

DA45 45 or 30 degree kingpin
OR
Other
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Old December 21st, 2017, 03:34 AM   #2
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Back in the day I broke 2 plates (XK-4) and a truck.

Now the only thing I would break would be a hip.....
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Old December 21st, 2017, 06:56 AM   #3
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Default Boen

Broke a Boen kingpin.
First gen ..Sheered off were the retainer was riding on it.
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Old December 21st, 2017, 12:30 PM   #4
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2 Bioani kingpins in 25 years. On a Star plate.

1 truck on a cheap **** Lazer X tech plate BOSS SPEED (Fake Boen)
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Old December 21st, 2017, 01:19 PM   #5
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Broke a Satellite plate, in half, broken Hard Candy truck, bent kin pin on a Sunlite plate
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Old December 21st, 2017, 10:05 PM   #6
Joey
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You folks breaking stuff doing jumps? Function of body weight? Just curious.

I'm a lightweight so no probs except old Sears skates (Roller Derby?) back in the '70s. Bent a few plates/supports doing big jumps. Never an axle.
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Old December 23rd, 2017, 02:54 PM   #7
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Default Broken gear list.

I tend not to break gear, but...


Here's what I've seen.

2x DA45 kingpins become loose in the plate, but not break.(avenger plates)
3x SG DA45 trucks, broken at the cushion platform.
1x SG DA45 truck with a broken/damaged pivot pin bore.



Other stuff..

2x broken Proline kingpins
Broken pivot pin on a riedell truck(thrust plate I believe)
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Old December 29th, 2017, 09:32 PM   #8
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I cracked 3 out of 4 of my Ultimate 3 trucks, then a couple Nova replacements. I also broke a Chicago 3/8-20 kingpin, the one that looks like a big panhead screw with a "C" stamped into the head.

No jumping to speak of, just speed skating and crashing.
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Old January 3rd, 2018, 01:13 AM   #9
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45's tend to place a little bit more torsional stress on the trucks and kingpins, due to the geometry. Most trucks break in a place I like to refer to as the "kingpin standoff" several theories here;

1. CAST trucks instead of forged, resulting in inconsistent material density/strength.

2. Cushions that are too soft.

3. Trucks that are too tight, changing the geometry, placing too much stress on the kingpin/truck (usually an indirect result of #2).

4. Adjustable pivots adjusted too high or low, or stripped, changing the geometry in a similar fashion to #3.

Also, when changing cushion hardness, (sometimes readjusting the pivot height is necessary to accommodate for "loading" (skaters weight, typically when changing to a softer cushion)


A lot of skaters that don't adjust their pivots (that have adjustable pivots) on their skates fail to set them up properly.

CAVEAT: kingpin strength itself also counts on material and manufacturing process as well. A grade 8/heat treated axle/kingpin would certainly fare better, but still isnt completely impervious to lateral loads, impact and pressure.

Thus, that is why 45's tend to break kingpins and trucks more often


Think of it this way: a wooden dowel would snap a lot faster laterally then stood on end when a load is applied to it.
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Old January 3rd, 2018, 01:15 AM   #10
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Quote:
Originally Posted by Joey View Post
You folks breaking stuff doing jumps? Function of body weight? Just curious.

I'm a lightweight so no probs except old Sears skates (Roller Derby?) back in the '70s. Bent a few plates/supports doing big jumps. Never an axle.

Perhaps the flex of the plates were absorbing the impact in lieu of the axles
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Old January 3rd, 2018, 11:49 AM   #11
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Default Cushions too soft

Quote:
Originally Posted by likkwid View Post
45's tend to place a little bit more torsional stress on the trucks and kingpins, due to the geometry. Most trucks break in a place I like to refer to as the "kingpin standoff" several theories here;

1. CAST trucks instead of forged, resulting in inconsistent material density/strength.

2. Cushions that are too soft.

3. Trucks that are too tight, changing the geometry, placing too much stress on the kingpin/truck (usually an indirect result of #2).

4. Adjustable pivots adjusted too high or low, or stripped, changing the geometry in a similar fashion to #3.

Also, when changing cushion hardness, (sometimes readjusting the pivot height is necessary to accommodate for "loading" (skaters weight, typically when changing to a softer cushion)


A lot of skaters that don't adjust their pivots (that have adjustable pivots) on their skates fail to set them up properly.

CAVEAT: kingpin strength itself also counts on material and manufacturing process as well. A grade 8/heat treated axle/kingpin would certainly fare better, but still isnt completely impervious to lateral loads, impact and pressure.

Thus, that is why 45's tend to break kingpins and trucks more often


Think of it this way: a wooden dowel would snap a lot faster laterally then stood on end when a load is applied to it.
I was of the understanding that the harder duro cushions contributed to kingpin breakage, never heard anyone mention that too soft a duro can cause kingpin breakage?
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Old January 4th, 2018, 12:05 AM   #12
Dennis Lauer
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Default Broken Skates

I have broken 5 Snyder Kingpins, cracked a hanger and broken the jump bar on Snyder Super Deluxe plate in the last 40 years.
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Old January 4th, 2018, 02:24 AM   #13
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Default I must be doing it wrong

I've never broken or bent a kingpin. I've bent one axle, in a Satellite.
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Old January 4th, 2018, 02:43 AM   #14
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Quote:
Originally Posted by Dennis Lauer View Post
I have broken 5 Snyder Kingpins, cracked a hanger and broken the jump bar on Snyder Super Deluxe plate in the last 40 years.
That is impressive.

I've never broken a king pin or bent an axle. I have worked on a fair amount of equipment and have seen parts wear out: mostly Snyder hanger taper for kingpin nut and pivot ball/cup.
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Old January 4th, 2018, 12:21 PM   #15
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I've snapped a couple of hardened steel kingpins on Sure-Grip Olympian plates and one on a Chicago Super Jet 45 degree plate. The Chicago stripped out the plate and had to have a larger kingpin after that. I used to know people that broke hardened steel snyder kingpins quite regularly doing double and triple jumps. One guy broke them once or twice a week until he switched to titanium.
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Old January 10th, 2018, 02:49 PM   #16
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Wow ya'll are hard on gear! I had some wheels handed to me a while back that the metal hubs had delaminated from the tires. The owner was skating them like that for a long time. And it was more than just a little noticeable. The tires were very loose on the hubs.
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