Sunday, June 28, 2009

Wide load...

So, thinking and thinking as i am want to do. I have a 29er 50 wide single wall Uma rim from Speedway cycles. The original plan was to build this on to a whub for the new bike. Then i got to thinking. Dangerous stuff. Kris Holm has a new 47mm wide, pre drilled, eyeletted double-wall rim available. It weighs just shy of 800g. The Uma weighs pretty much the same, but is inherently weaker due to the singlewall construction. Hmmmm.



Then i thought, at 800g it is unlikely i am going to use either for racing. A duster weighs ~500g, so why have 300g of extra rotating weight. Using the old multiply-by-4 rule for rotating mass, that is a colossal increase in weight.

What about a Salsa cycles Gordo? It is welded and double wall and eyeletted, but at a measley 35mm wide and 700g it is hardly a better compromise.

So now i am thinking of an Edge composites 40mm wide rim. (they are going to be coming out with a neato seat post also) Only issue...it ain't available yet...

5 comments:

Sam said...

What's wrong with a Duster? They are my new go-to general purpose rim... Wide (ish by your standards), lightish, strong, eyeletted, cheap, good tubeless, what more could you want?

dRjON said...

exactly! they rule...i have 2 sets running and they have been perfect. occasionally a wee bit wider is fun ;-)~

Anonymous said...

Do you really want a carbon rim? Edge are very,very good but how much of a weight saving is there? Now your frame, are you going to be running gears on it, and is the bottom bracket an EBB or some sort of BB30? Also your seat tube, is it 15.5", that's short and I presume your not a short chap.

dRjON said...

yes. carbon rims are a good thing imo. a little weight saving, a big hike in stiffness it seems. course proof in pudding. seat tube is 15.5" centre to top. 13.5 c-c. ebb, singlepseed or geared if i want

Cellarrat said...

the prices on the edge stuff scares meee.... i'm thinking about a new fall wheelset project for my Jabber