I need some numbers. On the Coker website, the weight of the tube is
given as 3.00 lbs, and the tyre as 31.00 lbs. Are they really that
heavy? I thought I’d seen about 530 g for the tube.
And what are the weights of the stock rim and the Airfoil rim?
people who unicycle are shyly exhibitionistic - GILD
Some approximate weights according to my postal scale:
Airfoil: 2 lb 11.1 oz
Tube: 1 lb 2.5 oz
Tire: 4 lb 8.0 oz
I just weighed a Coker tube on my cheap kitchen scale and it’s about 19.5 ounces (550 grams) give or take a bit because the scale is not very accurate.
Roger has some weights on the UK Unicycle.com web site:
Coker tyre: 1960g
Airfoil rim: 2 lbs 12oz (1.24kg) this is 2/3 the weight of the standard coker rim
From that we can infer that the stock steel rim is about 1.86 kg (4 lbs 2oz)
Thanks folks! This is for a Dutch MTB’er who wants to build a mountain bike around two 36" wheels (he is quite tall himself). He was baffled by the ridiculous weights on the Coker website. He approached me after finding my Coker rollout page while Googling (from which he could get the accurate diameter). Dave, I mentioned your SCWITW to him.
Klaas Bil
There’s also the option of using a 29er tube instead of the Coker tube. That’ll save some weight. Or you could go tubeless (with Stan’s No Tubes) like Ken did.
A MTB built around the Coker tire would be different. It would be unwieldy for singletrack but for wider and less technical trails or fireroads it would be, well, different. It’ll take care to make a big frame like that stiff enough. Longer chainstays, longer fork, it all adds up to more wiggle in the frame.
i once saw a sexy tandem (titanium no less) built around two coker wheels. It was at the cherry cycles bike shop in indiana. freaking great.
KB- those ridiculous weights on the Coker site will be volumetric shipping weights. Cokers are so big that for shipping purposes their weight is calculated volumetrically.
Re: weight of 36" rims, tyre, tube?
On Wed, 9 Mar 2005 16:45:39 -0600, “TonyMelton” wrote:
>KB- those ridiculous weights on the Coker site will be volumetric
>shipping weights. Cokers are so big that for shipping purposes their
>weight is calculated volumetrically.
Thanks for the clarification Tony. I shot Coker an e-mail about it and
this was their response:
> You are correct in that the actual weight of the 36x2 1/4" tire is close
> to 5 lbs. However, they have limits in the size and the type of item
> shipped. If you surpass these limits, there are surcharges which
> may have been applied to this product.
So it seems that you’re right, but stating those numbers as weights is
confusing to say the least. Making it a ‘nominal weight for shipping’
or so is better. And then also quote the real weight, something that
most people are more interested in (I think) than some value used to
calculate shipping cost.
BTW, why would the tube weight be overstated as well (at 3.00 lbs)? A
tube folds neatly into a smallish package, and so it isn’t a big and
unwieldy item.
people who unicycle are shyly exhibitionistic - GILD
Re: Re: weight of 36" rims, tyre, tube?
Coker has not yet been corrupted by the bicycle industry since they’re a car tire company. They haven’t learned yet that if you sell bicycle tires and tubes that you need to understate the weight. I suspect that they’ll get with the times soon enough and have more competitive weights for their bicycle and unicycle products.
Re: Re: Re: weight of 36" rims, tyre, tube?
I can see that their sort of ‘fake shipping weight’ is useful but I have suggested that they state a real weight as well. After some initial ‘resistance’, the salesperson whom I e-mailed with has taken the point and will forward my suggestion to the person responsible for the website. That is ‘soon enough’ indeed.
I don’t buy your point John that they should understate the weight. I was just objecting to overstating by a factor of about 7.
Klaas Bil
Re: Re: Re: Re: weight of 36" rims, tyre, tube?
That was a tongue in cheek comment about the bicycle industry practice of advertising weights that are less than the actual weights. Weights are marketing numbers to them and lower weights are better in the bicycle world so they’ll do whatever they can to fudge the numbers so the weights of their products are lower than the weights of the competitor’s products. Marketing numbers don’t have to match reality. That’s marketing.
Coker hasn’t fallen into that trap yet.