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29er Crest rim, built and perfectly true, DS spokes at max tension, but non - DS spokes at singnificantly lower tension.
Any attempt to increase spoke tension on the NDS move the wheel out of alignment which I then can't correct without violating the max rim spoke tension.
The DS is currently at 97kgf, the NDS is currently at 66kgf...they feel, well, flexy.
that's how it works
drive side is much "flatter" spoke angle so to get it to balance the nds you need higher tension
Remember that spoke tension will decrease once there's a tyre mounted.
Tension distribution vs dish [url= http://www.kstoerz.com/freespoke/fullcalc ]here[/url]
Tension affecting stiffness [url= http://sheldonbrown.com/rinard/wheel/index.htm ]here[/url]
The tyre is mounted. I rode the wheel today and it felt odd, when I returned and upped the tension a little, I hit the tension wall between the rims and the spokes.
Did you measure tension with or without the tyre?
That Sheldon Brown article is great, answers a lot of questions..
What hubs & spoke lengths did you use?
There always is a difference between the two sides on a rear wheel, but not usually that much.
Also if I've converted that correctly, thats 951 & 647 NM?
I'd guess at incorrect spoke length in one side & if those values are correct, I'd be wanting to double check my spoke calculations.
Spoke length irrelevant.
2nd Sheldon article interesting. Shame he didn't load the wheels, the 50kg if rider weight and decrease in tension must affect flex.
Deja-vu ? 🙂
As above, I'm aware that spoke tension, especially on the rear will be lower on the NDS due to the dish of the wheel, but it's more about the feel than he numbers. This isn't my first wheel build, but is the first where I've run into this problem.
Again, it's the coupling of a lightweight rim (crest 29er) with thin, lightweight spokes (DT Revs) that's causing the issue.
The spokes are 292mm in length for both sides. The recommended length, (according to my home made excel table) for CK ISO disk hubs on Crest 29er rims using a 3 cross lacing pattern are :
NDS rear = 293.4
DS rear = 292.4
NDS front = 292.4
DS front = 293.1
So 292mm spokes were used all round.
Tbf revs were never going to build the stiffest 29er wheel.
Stiffer 29er wheels? You'll be wanting Boost then....
How much difference will that frame and hub upgrade make druid?
Spoke length irrelevant.
How does that work then?
I must have been doing it wrong professionally for the last 13 years & my tutor from the ATG must also be wrong, along with the assessor from DT Swiss.
How can spoke length not affect the tension & dishing? They're all interrelated!
[quote=cynic-al ]How much difference will that frame and hub upgrade make druid?
Must be 15% Al. I thought all changes were 15% 😆
Goldenwonder, how can spoke length affect tension?
Tension is affected by how much spoke sticks out the end of the nipple or how far it inserts into it? Really? As long as the thread doesn't bottom out.
Doing professionally on and off since 1988 FWIW.
It'll affect tension if you've run out of thread...
Like I said...
Both tensions are well within 'tolerance' and a 3/2 ratio is about right for most standard layouts. The problems you will have come from:
Its a stans rim, it will be very soft and not want to hold tension.
Revs are quite stretchy, and prone to twist so again will lack tension consistency
Its a 29er wheel.
Adding tension wont do anything unless it looses a lot once the tyre is on (drops below 50) - which being a stans rim it might do. If thats the case you need to wind more on or it will be too soft.
[quote="goldenwonder"]
How does that work then?mostly physics. And a bit of common sense.
Please tell me you weren't actually listening to either your instructor or assessor.
mostly physics. And a bit of common sense.
I understand a belief system is a suitable substitute for these things
Oh and druid you made a recommendation bit can't back it up?