Sapim Super cx Ray spoke - tension table

Everything about building wheels, glueing tubs, etc.
robotec
Posts: 15
Joined: Tue Apr 18, 2006 6:32 pm
Location: Köln, Germany

by robotec

Ended up bulding my own calibration fixture
For my DT swiss Tensio values are as follows for the Sapim Super Cx Ray
Sapim Super Cx Ray.PNG

by Weenie


dtwolfen
Posts: 27
Joined: Wed Feb 15, 2017 9:05 pm

by dtwolfen

This is great, but what length spoke is this for? thanks.

Sent from my LG-H700 using Tapatalk


User avatar
ergott
Posts: 2867
Joined: Tue Apr 18, 2006 3:03 am
Location: Islip, NY
Contact:

by ergott

WinterRider wrote:
Sun Jul 15, 2018 12:14 pm
Cant remember that kgf rating.. think in the range of 150 kgf.
I can say with certainty that you didn't reach the elastic limit of the spoke. That's somewhere in the range of 250-300kgf and other things would have broke first.

fabriciom
Posts: 142
Joined: Mon Aug 31, 2015 8:42 pm
Location: Madrid, España

by fabriciom

This is only valid for whatever tensiometer you are using.

User avatar
ergott
Posts: 2867
Joined: Tue Apr 18, 2006 3:03 am
Location: Islip, NY
Contact:

by ergott

fabriciom wrote:
Fri Aug 10, 2018 4:29 pm
This is only valid for whatever tensiometer you are using.
:thumbup: :thumbup: :thumbup:

Yup

fabriciom
Posts: 142
Joined: Mon Aug 31, 2015 8:42 pm
Location: Madrid, España

by fabriciom

I ended up building a similar contraption to calibrate a Chinese tensiometer I purchased off AliExpress. Still away better deal than buying the one from dt or sapim. I think.

robotec
Posts: 15
Joined: Tue Apr 18, 2006 6:32 pm
Location: Köln, Germany

by robotec

dtwolfen wrote:
Thu Aug 09, 2018 9:37 pm
This is great, but what length spoke is this for? thanks.

Sent from my LG-H700 using Tapatalk
When I look at DT-SWISS calibration/conversion tables, there is no impact of spoke length indicated. Nor does Sapim indicate any dependency
I assume irrelevant impact of spoke length, as long as measurement distance from Tensiometer is sufficiently shorter than full spoke length.
Spoke length used was 298mm

fabriciom
Posts: 142
Joined: Mon Aug 31, 2015 8:42 pm
Location: Madrid, España

by fabriciom

robotec wrote:
Fri Aug 10, 2018 7:37 pm
dtwolfen wrote:
Thu Aug 09, 2018 9:37 pm
This is great, but what length spoke is this for? thanks.

Sent from my LG-H700 using Tapatalk
When I look at DT-SWISS calibration/conversion tables, there is no impact of spoke length indicated. Nor does Sapim indicate any dependency
I assume irrelevant impact of spoke length, as long as measurement distance from Tensiometer is sufficiently shorter than full spoke length.
Spoke length used was 298mm
Not only does spoke size matter but also where you place the tensiometer in the spoke.

At least tha is the case that happened to me.

User avatar
ergott
Posts: 2867
Joined: Tue Apr 18, 2006 3:03 am
Location: Islip, NY
Contact:

by ergott

Not for my tensiometer.

Get one that has minimal side load on the spoke for better accuracy.

https://www.wheelfanatyk.com/store/digi ... ion-gauge/

fabriciom
Posts: 142
Joined: Mon Aug 31, 2015 8:42 pm
Location: Madrid, España

by fabriciom

https://www.aliexpress.com/item/Spoke-t ... 25335.html

50€, I dont mind placing the thing in the same place...

User avatar
F45
Posts: 898
Joined: Wed Jun 08, 2011 6:08 am

by F45

I'd prefer the Park to that aliexpress one. But good job on making a calibrator. I made one as well.

robotec
Posts: 15
Joined: Tue Apr 18, 2006 6:32 pm
Location: Köln, Germany

by robotec

Homegrown spoke calibrator
IMG_3788.JPG

MikeD
Posts: 142
Joined: Thu Dec 11, 2014 9:55 pm

by MikeD

I've got a problem with my Park tensiometer. Squeeze and take a reading get one reading. Squeeze and pull the gage apart slightly and squeeze slightly so it takes a neutral setting on the spoke, get a lower reading. Seems like there's inherent friction in the gage. Looked at the gage and the end of the tension spring rubs against the head of a slotted bolt. There's no anti friction surface there. It's like the springs on caliper brakes before they put a plastic bushing there to prevent metal on metal contact and your brakes wouldn't center after a while. Flawed design, in my opinion, and I don't know which reading is correct, the squeeze and read or squeeze, pull apart... for a neutral setting. (This is hard to describe, so I hope there is understanding what I'm meaning).

DamonRinard
in the industry
Posts: 348
Joined: Fri Apr 29, 2011 8:32 pm
Location: Connecticut, USA

by DamonRinard

Hi Mike, you described it well. On my Park tensiometer I put a drop of lube there.

Cheers,
Damon
Damon Rinard
Engineering Manager, Road Bikes
Cycling Sports Group, Cannondale
Ex-Kestrel, ex-Velomax, ex-Trek, ex-Cervelo

robotec
Posts: 15
Joined: Tue Apr 18, 2006 6:32 pm
Location: Köln, Germany

by robotec

fabriciom wrote:
Fri Aug 10, 2018 9:05 pm
robotec wrote:
Fri Aug 10, 2018 7:37 pm
dtwolfen wrote:
Thu Aug 09, 2018 9:37 pm
This is great, but what length spoke is this for? thanks.

Sent from my LG-H700 using Tapatalk
When I look at DT-SWISS calibration/conversion tables, there is no impact of spoke length indicated. Nor does Sapim indicate any dependency
I assume irrelevant impact of spoke length, as long as measurement distance from Tensiometer is sufficiently shorter than full spoke length.
Spoke length used was 298mm
Not only does spoke size matter but also where you place the tensiometer in the spoke.

At least tha is the case that happened to me.
Verification of tensiometer reading vs tension in calibrator
I compared 258mm CX ray and 292mm CX Ray and did the avg on 3 spokes each
shows tensiometer reading are virtually identical --> independent of spoke length .... when measured with DT Swiss Tensio

(I believe there is significantly more variation in how I am holding the Tensiometer and possibly spoke thickness affecting the reading than by spoke length)

by Weenie


Post Reply
  • Similar Topics
    Replies
    Views
    Last post