Surf Rodz Community Measurements

1

So there’s some anecdotal evidence that Surf Rodz trucks have some variability in their dimensions.

If we could crowdsource some measurements on both TKP and RKP trucks that’d be awesome.

What dimensions are we talking about?

For TKP, across the flats of the hex-shaped hanger. Should be roughly 19mm

(insert photo when i get home)

For RKP, across the parallel portion of the hanger. Should be roughly 18mm

(insert photo when i get home)

If we can get enough measurements we should be able to create a 95% confidence interval to make more accurate parts.

How to measure TKP

  • Measure each of the 3 faces and input the numbers as a set separated with commas. Example (18.93, 18.95, 18.92)
  • Measure between the end of the hanger and the setscrew hole
  • Do this for both ends of the hanger

How to measure RKP

  • Measure the parallel faces on both ends of the hanger and input the numbers as a set separated with commas. Example (18.23, 18.21)
  • Measure between the end of the hanger and the setscrew hole
  • Do this for both ends of the hanger

Post your measurements in this thread when you get a chance, along with any other relevant info you can about the hangers being measured.

Thanks for your help in advance!

9 Likes
2

SR TKP GrINDeeSZ 10mm

The outlier, didnt work well with my SR Press fits

18.97,18.98,18,98
18.96,18.97,18.98

2 Likes
3

SR TKP 177’s

(18.90,18.88,18.92); (18.89, 18.92,18.93)

1 Like
4

I will do so when I get home for the RKP. And correct me if I am wrong but the exact definition of precision is that they are the exact same. From what it looks like it is a ± .01 up to .04 mm of a tolerance in the TKP. The measurments don’t sound like alot but when drill press can have a run out of a .001 it sounds like SR needs to do a tune up on their milling machines.

1 Like
5

No experience in CNC, but I thought it it is good practice to take a very thin layer off your stock to remove any exterior defects, size all your stock the same, and make it look nice and uniform if it is not perfect from the factory.

I wonder if SR does this? Do they need to? Might help with these tolerances.

2 Likes
6

Those tolerance zones are irrelevant for skate performance. Why have tight tolerances everywhere on the truck when it doesn’t make a difference to performance?

7 Likes
7

I think @Janux-esk8 may have mentioned some knowledge about this topic to me.

8

I might have some difference in performance. It may be slight but that is still a difference. It could be that one set of trucks or a single truck can have a deeper lean.

9

SR RKP 200 (18.1, 18.1)

SR TKP 177 (18.97, 18.97, 18.97); (18.96, 18.97, 18.99)
SR TKP 177 (19.02, 19.02, 19.03); (19.04, 19.03, 19.04)

1 Like
10

For SR TKP:

  • Number of data points is 24
  • Average measurement is 18.97mm
  • Absolute Min is 18.88mm
  • Absolute Max is 19.04mm
  • Standard Deviation of the sample is 0.046108mm
  • 97.7% of all measurements are less than or equal to 19.06mm
  • 99.8% of all measurements are below 19.11mm

We need more data to narrow this down.

Again, any help would be appreciated!

3 Likes
11

More TKP’s

10mm Grindz, 127mm

(19.05, 19.04, 19.07); (19.05, 19.06, 19.04)
(19.05, 19.04, 19.05); (19.04, 19.05, 19.03)

4 Likes
12

SR TKP, 177mm
(19.13, 19.33, 19.09); (19.10, 19.08, 19.09)
(19.24, 19.09, 19.11); (19.09, 19.25, 19.14)

3 Likes
13

SR TKP, 177mm
(19.13, 19.08, 19.16); (19.09, 19.08, 19.16)
(19.09, 19.15, 19.06); (19.07, 19.08, 19.06)

1 Like
14

Absolute max went out the window unfortunately :joy:

2 Likes
15

I have a 3rd set, unmounted, but can’t seem to lay hands in6 them at the moment. Damn kids :grin:.

If it matters, all of mine are 2+ years old.

1 Like
16

SR RKP 200mm (18.11, 18.12)

2 Likes
17

image
image1054×687 153 KB

Maybe this helps

1 Like
18

After I get back from work I’ll get the datas

1 Like
19

That’s a good pdf.

A 19.05 bar could be anywhere from 18.8mm to 19.3mm. So far all the measurements are within this range.

@mmaner some of those seem way too high given their nearest neighbors. Could you re-check them? I’m usually taking 3 or 4 measurements per and taking the most consistent.

2 Likes
20

I’ve started an excel sheet.

image
image730×261 6.33 KB

image

1 Like