Wheelbuilding / Wheel Building / Wheel build help

If you want lighter, you best be going tubular.

ftfy

I've been looking and can't find a definite answer , what's the lightest box section rim avalible (not carbon) ? Clincher is the only requirement I have

Weightweenies give the closest thing to a definitive answer, in this case that the American Classic CR350 was the lightest widely available metal 700C clincher rim. If they are boxy enough for you, there are some NOS 28H ones on t'bay at the moment.

Tubulars are by far the lightest. Got a pair of mavic gel280 rims in 28h hanging up. 305 g each.

The problem with all very light and narrow clincher box section is they are hopeless unstiff. You end up having up the spoke count and use thicker spokes to get it to hold together and to give it resonable stiffness.

Those mavic i have will be laced to fixed gear hubs that should work fine. So if you do buy those am classic rims i hope they are going to be used with fixed gear hub that could work.

The problem with all very light and narrow clincher box section is they are hopeless unstiff.

Indeed, largely due to needing to keep the spokes tension low.

Those mavic i have will be laced to fixed gear hubs that should work fine. So if you do buy those am classic rims i hope they are going to be used with fixed gear hub that could work.

How does the fact it's a fixed hub help with stiffness? Is it the lack of dish?

Pls, 270g Fiamme Ergal Yellow on my HC bike.

270g Fiamme Ergal

Mavic Argent/Or 7 is typically 5-10g lighter than Fiamme Ergal. Keeping those things for front wheels on HC bikes is certainly the right choice.

Flanges far apart, much bracing.

Thanks.

Spoke tension does not affect stiffness edscoble. low spoke tension does however affect the ammount of side load that can be applied before spokes go slack. when this happens at low load it means your wheels are not very stiff but increasing the spoke tension does not alter the stiffness in N/mm but it does raise the ammount of load that has to be applied before spokes go slack. This is often confused with spoke tension affecting tension. I can see why the confusion results.

also with a fixed gear build you only have to tension the rear wheel to 1000N and these light rims wont be able to handle much more that.

Got hold of the first pair of dt swiss r460 rims today in 24h and 28h but they are seriously over weight at 485g. This is disapointing for a 23mm deep rim. At least madison have stock now.

seriously over weight

485/460=1.05

If 5% is seriously overweight in your book, I'm morbidly obese.

well if they called it r485 then it would be fine. Other rims manage to come at claimed weights and as the extrusions dies wears weight will only go one way.other dt rims have been spot on.

The New Pacenti rims (ones you can now get tyres on) seem to be coming in really light. Apparantly we should be buying them up before the extrusion die wears and they get heavier. Which I found kinda interesting.

I've developed a hate for road clinchers so not for me though.

I am aware an extrusion dye costs around 5-10 K pounds, but even so they could replce them when due... it's still going to be a realtively small cost to offset that might add a few pennies to the retail cost of the rim

Can anyone find me a 28h track hub that's not Mack?

http://www.ebay.com/itm/BDW-2014-Track-Hub-Bolt-on-type-Fix-Fix-Single-Speed-20H-24H-28H-32H-36H-/231552486877?var=530792988833&ssPageName=ADME:X:EAC:GB:3160
I think they're novatec, they have matching fronts too

Good effort, ta. This HC bike might actually get finished.

http://www.bdopcycling.com/Hubs-FGSS.asp

Miche Primato also come in 28h apparently.

Yeah, but allow Miche. Also impossible to find as just a rear hub. The BDW one above is perfect, plus claimed weight isn't too awful.

it's still going to be a realtively small cost to offset that might add a few pennies to the retail cost of the rim

I suspect that the dies come to more than a few pennies per rim, my best guess would be about ten times that, so to an order of magnitude between £0.1 and £1.0, assuming they actually have a long enough production run to go through numerous dies and therefore amortise the cost of design and trial dies down to a reasonable figure per rim. You might get upwards of 50,000 rims from a die, the tooling costs become even more significant if production runs are short. DT Swiss group turnover is only about £70M p.a., carve that up over their product portfolio and lifecycle and they might never get to the end of life for a particular aluminium rim die unless it's a best seller which stays in the catalogue for many years.

If you're extruding to a design size of 1mm wall thickness and dies get replaced when that has gone up to 1.05mm, that will get to @thecycleclinic 's "seriously overweight" but it's neither here nor there in terms of the rim's function. Whatever the amortised cost per rim the die comes to, multiply by 10 if you want the rim weight to be held to ±0.5%

Really got a box full of 28h rear miche track hubs.

I love Miche track hubs... they are so awesome for the money!