Chinertown
Chinese Carbon MTB => 29er => Topic started by: Sitar_Ned on June 21, 2015, 08:53:12 PM
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As always, an overly dramatic video to announce the winner:
https://youtu.be/X-M44eELdM8
Also as always, something doesn't quite work as planned and this time you can't really read the winning name when I pull it in for it's close-up, due to the lighting and neon paper.. So.. Congrats to cmh! Coincidentally, if I remember correctly, he's also a seasoned wheel builder, so that worked out well.
Thanks to all who participated, and congrats again to cmh! We'll be doing the next giveaway when the forum hits 10k posts - So hang around!
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Congrats CMH..
I expect a full review..
HA!
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Nice, congrats cmh
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Congrats cmh.
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Awesome drawing wheel. But I miss the pretty lady from the last drawings.
Congrats CMH! I was only 5 away! Maybe next time...
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Wait to go!
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Obligatory congrats to cmh, but damn.. I really wanted to win these rims! Had some fat tyres picked out and everything. Lol.
Awesome drawing wheel. But I miss the pretty lady from the last drawings.
Yes. Miss Chinertown. I too am a fan ;D
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Congrats CMH! Another awesome Chinertown giveaway!
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As always, an overly dramatic video to announce the winner:
https://youtu.be/X-M44eELdM8
Also as always, something doesn't quite work as planned and this time you can't really read the winning name when I pull it in for it's close-up, due to the lighting and neon paper.. So.. Congrats to cmh! Coincidentally, if I remember correctly, he's also a seasoned wheel builder, so that worked out well.
Thanks to all who participated, and congrats again to cmh! We'll be doing the next giveaway when the forum hits 10k posts - So hang around!
WHOA! Awesome! That's freaking sweet! :D Amusingly enough - I found out when I got an email from the guy who bought the carbon rims I sold here on the classifieds! Now that's some karma or something. :D
So what now? Really looking forward to this build!
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Very Cool Chris! Congrats! ;D
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So what now? Really looking forward to this build!
Hey cmh.. Just email Peter and he'll hook you up. He's already been made aware that you won. There may be a delay in the process bc apparently he's unavailable for the next couple days.
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So what now? Really looking forward to this build!
Hey cmh.. Just email Peter and he'll hook you up. He's already been made aware that you won. There may be a delay in the process bc apparently he's unavailable for the next couple days.
He chooses _now_ to have a kid? Where's his priorities? ;D
No worries, while I can't wait to see them, I can be patient.
Thanks again!
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Hey cmh, do you have plans in mind for the rims? Hubs? For a current build or a new build?
Pretty sweet prize! Hope you enjoy them.
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Hey cmh, do you have plans in mind for the rims? Hubs? For a current build or a new build?
Pretty sweet prize! Hope you enjoy them.
Thinking about that. I just got a MTB270 rear hub from BikeHubStore.com for an unrelated build, so I was thinking a set of those hubs, and maybe the Sapim D-Light spokes - 2.0/1.65, lighter than the Race but not as crazy thin as the Laser or as expensive as the CX-ray. I think that'd be a good balance of light and stiff that should match those rims pretty well. Been really enjoying working with the Sapim hex-head nipples as well, but I used those on my carbon fat bike rim build and the Park tool I have for the 5.5mm hex heads didn't fit into the holes in the carbon rim. Guessing it'd be the same for these, as well. Looking at 5.5mm nut drivers online but nobody says the outer diameter of their tools - because who would want to know that? :D
Initially thought I'd pair them with a set of American Classics that we have waiting for rims right now, but I think I might save those for a lighter rim. Have eyeballed the 27mm rims on XMCarbonSpeed a couple times for that build, but that one will have to wait!
Open to suggestions, but the BHS hubs and D-Lights sure seems like a good base for the build.
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Had to update my spoke length calculation spreadsheet to account for the offset - I don't usually work with offset rims - but after I did, I'm even more excited to try these out. With the offset, the flange distance ratio is 78.8% in the front and 72.4% in the rear. That's damn nice - those hubs are 64% and 57% on a zero-offset rim, and that usually translates to the tension balance - so 100kgf on the tight side would work out to as low as 57kgf without the offset, but ~72kgf with. That should help make for a damn durable wheel!
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Had to update my spoke length calculation spreadsheet to account for the offset - I don't usually work with offset rims - but after I did, I'm even more excited to try these out. With the offset, the flange distance ratio is 78.8% in the front and 72.4% in the rear. That's damn nice - those hubs are 64% and 57% on a zero-offset rim, and that usually translates to the tension balance - so 100kgf on the tight side would work out to as low as 57kgf without the offset, but ~72kgf with. That should help make for a damn durable wheel!
It looks you were the right person to win the rims.
I did not understand most of what you said above :) But one day I'll build a wheel... Congrats!
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It looks you were the right person to win the rims.
I did not understand most of what you said above :) But one day I'll build a wheel... Congrats!
LOL! The key to strong wheels is even spoke tension - all the spokes are sharing the load equally. On a MTB wheel, that's not possible because gears and brakes shove the flanges inboard. When they're not an even distance from the centerline, their bracing angles become different, and this means different tension needed to keep everything in balance. Imagine if you have a wheel where the right flange is 20mm from the centerline, and the left flange is 40mm from the centerline. This means the left side will have a bracing angle double that of the right, and as such will require half the tension of the right side to keep everything balanced. The problem there is that the maximum tension is dictated by the rim (something I'll have to find out from Peter on these) and so that maximum tension will happen on the right side. If the left side is at half the tension, then it's possible for those spokes to go slack in a big hit, and that's where spoke fatigue breakage comes from - loss of tension followed by a very abrupt rise in tension. It can also allow the nipples to turn which leads to things coming out of true.
So, with these rims and the offset spoke holes moving that point closer to the center of the flanges, what would be a 57% balance in the back becomes 72% - keeping the left side much closer in tension to the right side, which should make for a stronger and more durable wheel overall.
You should definitely learn to build a wheel - bike wheels are a beautiful thing - very few structures combine the light weight and massive strength of bike wheels, and when you understand how it all goes together, for me at least, it improves the riding experience. An initial build of wheels is not difficult - it can be tricky when you go with really lightweight components, though. Your first wheel build should always be as burly as you can stand. That'll also help cover n00b mistakes which might ruin a fancy/lightweight build.
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Well, had an attempted delivery Friday while we were out of town (biking, of course) so my wife stopped by the post office today, and the box is waiting for me at home. Pretty stoked - today was also the first day I rode the bike to my current job, something that I didn't think would be possible due to the roads around here. Still need to order hubs and spokes and such, but I'm stoked to be able to see them soon!