Powertap GS rear hub and spoke lenghts

[LouisN]

So I finally pulled the trigger on a GS hub .
A topic relative to this specific hub and the spoke lenght choices.

I'll order straight CX Rays and don't want to miss.

Anybody already built this hub ?
Do I choose the same lenght as J-Bend with the Spocalc Ex. Spreadsheet table ?

Thanks for the heads up

Louis

[Mackers]

You can go to the powertap website and download the pdf with spoke lengths.

All you need to do is look up the ERD of your rim and the pdf will tell you the length needed.

[LouisN]

https://www.powertap.com/Uploads/PDF/Po ... -chart.pdf

Ok, I'll check and compare these numbers with my usual spreadsheet. Thanks !

Louis

[Johnny Rad]

So I finally pulled the trigger on a GS hub .
A topic relative to this specific hub and the spoke lenght choices.

I'll order straight CX Rays and don't want to miss.

Anybody already built this hub ?
Do I choose the same lenght as J-Bend with the Spocalc Ex. Spreadsheet table ?

Thanks for the heads up

Louis

What does your new GS 24spoke hub weigh?

If you don't mind me asking, what's your weight?

Alloy or brass nipples for your build?

I'm right behind you... the GS seems way too good to pass up.

[4151zero]

same here, bought the deal on a GS hub, thanks for the PDF link

[kcb203]

So I finally pulled the trigger on a GS hub .
A topic relative to this specific hub and the spoke lenght choices.

I'll order straight CX Rays and don't want to miss.

Anybody already built this hub ?
Do I choose the same lenght as J-Bend with the Spocalc Ex. Spreadsheet table ?

Thanks for the heads up

Louis

I used the chart that PowerTap puts out and just about bottomed out the spokes as I came up to full tension. I might have had the ERD off, but I don't think so. I'd err on rounding down on spoke length.

[Johnny Rad]

What does your new GS 24spoke hub weigh?

If you don't mind me asking, what's your weight?

Alloy or brass nipples for your build?

I'm right behind you... the GS seems way too good to pass up.

My GS hub came in today and weighs 328g vs the stated weight of 320g.

Is this a place where I can get some build recommendations on spokes, nipples, etc. I'd like to visit my builder with some ideas.

As background, I'm happily riding 2015 Reynolds Attacks (20/24 and straight pull spokes all around; clinchers and not marketed as tubeless compatible). I think they weighed-in right around the mfg weight of 1365g/set. At 160-165lbs / 72.5-75kgs, I haven't noticed any untoward issues with my Reynolds. As this is WW, I'd like to keep weight gain to a minimum with my new GS hub and don't care for bladed spokes.

Not sure that I'll actually do it, but I'd like to swap in an Extralite hub up front while I'm at it. Love me some Fairwheel Bikes! Ideas for it?

Thanks!

[LouisN]

This is what I received from Saris :

Thank you for contacting PowerTap.
Sapim CX Ray spokes will do well.
Drive side tension should be 120-140 Kgf and just make sure non-drive is even.
It will probably be low. If you have any more questions do not hesitate to contact us.

Thank you,





Louis

[kervelo]

My rear wheel with GS/CX Ray/Easton R90 SL is almost ready. I set the target of DS tension to 120 and the current tension is approximately 116. As a novice wheel builder I perhaps set the target a bit too low: I think I will have to adjust it a bit. However, the max tension for the rim is 122 kgf. The NDS tension of my wheel is currently around 55 kgf.

[kervelo]

My rear wheel with GS/CX Ray/Easton R90 SL is almost ready. I set the target of DS tension to 120 and the current tension is approximately 116. As a novice wheel builder I perhaps set the target a bit too low: I think I will have to adjust it a bit. However, the max tension for the rim is 122 kgf. The NDS tension of my wheel is currently around 55 kgf.

Added some more tension to the wheel, now the DS 125 kgf and the NDS almost 60 kgf. Will continue by riding for some months on trainer before testing the wheel on the road.

[kervelo]

My rear wheel with GS/CX Ray/Easton R90 SL is almost ready. I set the target of DS tension to 120 and the current tension is approximately 116. As a novice wheel builder I perhaps set the target a bit too low: I think I will have to adjust it a bit. However, the max tension for the rim is 122 kgf. The NDS tension of my wheel is currently around 55 kgf.

Added some more tension to the wheel, now the DS 125 kgf and the NDS almost 60 kgf. Will continue by riding for some months on trainer before testing the wheel on the road.

Have now been riding the wheel for more than 1100 kms and over 35 hours on kinetic R&R trainer. No issues so far: the wheel has not exploded and it is still round and true.

[sugarkane]

There is no need to take it above 120kgf unless it has extra low tension ratios then if the rim is carbon and new maybe 125.. At 140kgf you may taco the rim.. There isn't any need for that kind of tension

[Johnny Rad]

Here's some more weight info as I get closer to taking possession of my new hand-built rear wheel with power that's all but guaranteed to make me faster! Right?!

As noted earlier, my Powertap GS rear hub weighed in at 328g. I now know that my outgoing 2015 Reynolds Attack (non-tubeless) rear hub weighed in at 255g. My trusty calculator says that's just 73g / .16lbs more.

I had my Attack built-up with CX-Ray spokes and will post a weight next week or so when I get it paired to my new Garmin 520 (still enroute). My builder said it went like clockwork. Hopefully, the CX-Rays weigh less and are better than the OEM spokes.

Furthermore, I plan to remove the Garmin GSC10 sensor from my chainstay for a sleeker look (and lose a skosh more weight since this is WW after all ... or maybe I should just drillium!).

My GS hub came in today and weighs 328g vs the stated weight of 320g.

[kavitator]

spoke lengths from Powertap diagram will work.
Nice hub with good geometry. NDS spokes must be minimal 50kg. Try to tension spokes with inflated tire again (for chlincher rims).

[kervelo]

...Try to tension spokes with inflated tire again (for chlincher rims).

In general, is that the recommended way for getting the tension right?

I have noticed that the tension drops significantly when having the inflated tyre on, but have never re-tensioned the wheels I have built.