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#21
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How to drill a nightrider 36 rim?
flyer wrote: Okay, so an update on this. I drilled 34 (decided it was unwise to widen the valve hole or drill a huge hole over the rim join) 3/4" (1.9cm) holes in my nightrider. It looks pretty badass, and I'll post pictures a bit later. I don't have the equipment to put smaller holes on the inside diameter of the rim, but the final weight ended up at 1048g. That's a whopping 68 grams off the stock wheel! Now I just have to rebuild the unicycle, and see if it was worth the trouble and if the weaker rim holds up. After I shave down the tire and swap out my rim strip, I'm looking at a half kilo (providing my tire tread removal estimate is right) of weight off a nightrider tire/rim combo with a 29'er tube. woo! This is really exciting stuff. I can imagine how spectacular a crash it might be if a 36" inch wheel tacoed underneath you. -- lpounds '' (http://youtube.com/watch?v=7-q-VOaDB7M&feature=related) ------------------------------------------------------------------------ lpounds's Profile: http://www.unicyclist.com/profile/15958 View this thread: http://www.unicyclist.com/thread/72139 Posted Via Usenet.com Premium Usenet Newsgroup Services ---------------------------------------------------------- http://www.usenet.com |
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#22
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How to drill a nightrider 36 rim?
Cool stuff, you are going to have to let me try it when I get to St. John's. What did you use to drill the holes? Drill press? What did you use to de-bur the rim with after you were done? Still looking forward to seeing someone drill all the way through, I might just buy that SE rim from Levi and drill it instead of building up an UW. Anybody have a shop I could borrow anywhere east of Toronto? -- saskatchewanian ------------------------------------------------------------------------ saskatchewanian's Profile: http://www.unicyclist.com/profile/14180 View this thread: http://www.unicyclist.com/thread/72139 Posted Via Usenet.com Premium Usenet Newsgroup Services ---------------------------------------------------------- http://www.usenet.com |
#23
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How to drill a nightrider 36 rim?
flyer wrote: woo! Good stuff, Dave! I bet it won't crumple. In fact, I reckon it can go further... I've just calculated how much it saves to put two holes between each spoke. This is based on drilling 70 holes - missing the two at the valve; taking density of material as 2.71g/cm^3 (which came out just right for my own drilling pattern estimate, using 1mm as thickness for the inner wall) and taking a thickness of 2.6mm for the outside wall, based on calculating from Dave's weight saved - that seems reasonable from looking at the valve hole. So by drilling 70 holes of the following diameters into the visible wall of a Stealth rim I think we can save: 15mm: 87g 16mm: 99g 17mm: 112g See attached sketch to estimate how prudent, or otherwise, this plan may look. Sam +-------------------------------------------------------------------+ |Filename: nightrider drilling.png | |Download: http://www.unicyclist.com/attachment/28379 | +-------------------------------------------------------------------+ -- redwelly ------------------------------------------------------------------------ redwelly's Profile: http://www.unicyclist.com/profile/4518 View this thread: http://www.unicyclist.com/thread/72139 Posted Via Usenet.com Premium Usenet Newsgroup Services ---------------------------------------------------------- http://www.usenet.com |
#24
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How to drill a nightrider 36 rim?
redwelly wrote: Good stuff, Dave! I bet it won't crumple. In fact, I reckon it can go further... I've just calculated how much it saves to put two holes between each spoke. This is based on drilling 70 holes - missing the two at the valve; taking density of material as 2.71g/cm^3 (which came out just right for my own drilling pattern estimate, using 1mm as thickness for the inner wall) and taking a thickness of 2.6mm for the outside wall, based on calculating from Dave's weight saved - that seems reasonable from looking at the valve hole. So by drilling 70 holes of the following diameters into the visible wall of a Stealth rim I think we can save: 15mm: 87g 16mm: 99g 17mm: 112g See attached sketch to estimate how prudent, or otherwise, this plan may look. Sam Couldn't you cut bigger holes if you put one hole closer to one edge of the rim and the other hole closer to the other edge of the rim? -- GizmoDuck The Uninam Tour 2008.....Hanoi to Saigon!!! www.uninam.net The SINZ Unicycle Tour 2007....South Island, New Zealand www.sinzuni.org The Induni Unicycle Tour 2009. Unicycle Tour of India. Email me for details. ------------------------------------------------------------------------ GizmoDuck's Profile: http://www.unicyclist.com/profile/794 View this thread: http://www.unicyclist.com/thread/72139 Posted Via Usenet.com Premium Usenet Newsgroup Services ---------------------------------------------------------- http://www.usenet.com |
#25
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How to drill a nightrider 36 rim?
GizmoDuck wrote: Couldn't you cut bigger holes if you put one hole closer to one edge of the rim and the other hole closer to the other edge of the rim? Yeah, possibly. Although I don't think you can drill too close to the edge as there are internals of the rim cross-section that you wouldn't want to hit. I think that it is the same as the 'cross-section on the KH29 rim' (http://www.unicycle.uk.com/Images/Shop/Krisholmrim.jpg). The attached sketch might be OK though. Also, if you make the holes zig-zag then the main width of the bridge of material going from one side of the rim to the other would not be straight. Would that be a problem? I don't know, as I don't really understand how the material strength/structure works. Sam P.S. I don't know why Illustrator has made this into a magical rainbow, but I'm not going to fight it. +-------------------------------------------------------------------+ |Filename: nightrider drilling2.png | |Download: http://www.unicyclist.com/attachment/28382 | +-------------------------------------------------------------------+ -- redwelly ------------------------------------------------------------------------ redwelly's Profile: http://www.unicyclist.com/profile/4518 View this thread: http://www.unicyclist.com/thread/72139 Posted Via Usenet.com Premium Usenet Newsgroup Services ---------------------------------------------------------- http://www.usenet.com |
#26
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How to drill a nightrider 36 rim?
How about oval holes You could drill the holes so they are touching then grind the inside to make flat sides to the ovals. something like the Monty 221 rims [image: http://www.hbtrials.com/photos/monty...front_rim.jpg] That way you would leave more material near the spoke holes. I don't think that a skinny bridge between two holes where there is no spoke adds a whole lot to the strength or integrity of the wheel. -- saskatchewanian ------------------------------------------------------------------------ saskatchewanian's Profile: http://www.unicyclist.com/profile/14180 View this thread: http://www.unicyclist.com/thread/72139 Posted Via Usenet.com Premium Usenet Newsgroup Services ---------------------------------------------------------- http://www.usenet.com |
#27
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How to drill a nightrider 36 rim?
Hey Dave, Its been a couple months, how is the wheel holding up? And any pics yet? Sorry I didn't make it to St. Johns, missed the last ferry out of Labrador. -- saskatchewanian ------------------------------------------------------------------------ saskatchewanian's Profile: http://www.unicyclist.com/profile/14180 View this thread: http://www.unicyclist.com/thread/72139 Posted Via Usenet.com Premium Usenet Newsgroup Services ---------------------------------------------------------- http://www.usenet.com |
#28
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How to drill a nightrider 36 rim?
redwelly;1078693 wrote: I didn't weigh my actual rim beforehand, but going by the stated weight of 1116g, and my measured 'after' weight of 1069, I saved 47g. Unicycle.com are you reading this? What a ridiculous amount of effort riders are going to to save a few grams. We definitely need a lighter, possibly bigger road tire and rim combination. Cokers are tanks that are not entirely designed for speed. We want to go fast and hurt ourselves!!! -- Rowan ------------------------------------------------------------------------ Rowan's Profile: http://www.unicyclist.com/profile/3772 View this thread: http://www.unicyclist.com/thread/72139 Posted Via Usenet.com Premium Usenet Newsgroup Services ---------------------------------------------------------- http://www.usenet.com |
#29
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How to drill a nightrider 36 rim?
Isn't anodizing lighter than powder coat, as its the metal that turns color...? If your willing to do all that drilling why would you not also strip the paint or at least op for anodized coloring? -- agentQ '*)--SmallSpin-'O,*' (http://www.youtube.com/watch?v=IiFMXG116BE) '*)---TreFlip-'O,' (http://www.youtube.com/watch?v=zpT0YFDgmz4) '*)--DoubbleFlip-'O,*' (http://www.vimeo.com/683454) --- 'Uneed Films' (http://www.uneedfilms.com) ------------------------------------------------------------------------ agentQ's Profile: http://www.unicyclist.com/profile/13021 View this thread: http://www.unicyclist.com/thread/72139 Posted Via Usenet.com Premium Usenet Newsgroup Services ---------------------------------------------------------- http://www.usenet.com |
#30
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How to drill a nightrider 36 rim?
agentQ;1124760 wrote: Isn't anodizing lighter than powder coat, as its the metal that turns color...? If your willing to do all that drilling why would you not also strip the paint or at least op for anodized coloring? The original nightriders were anodised black as far as I know. I dunno who it was who thought it would be a good idea to powdercoat them "Stealth white". -- Rowan ------------------------------------------------------------------------ Rowan's Profile: http://www.unicyclist.com/profile/3772 View this thread: http://www.unicyclist.com/thread/72139 Posted Via Usenet.com Premium Usenet Newsgroup Services ---------------------------------------------------------- http://www.usenet.com |
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