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#1
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29" inner tube in a Coker
Hi all, I've read a number of posts on the subject of using a 29" tube in a coker and as no one actually to have reported on actually doing it, I though that I'd give it a go myself - out of curiosity as much as anything so I got myself a 700x35-47 Hutchinson Buutyl inner tube and popped it into the coker - it took a bit of fiddling to get the tyre on but this was accomplished with out any pinch flats. I then inflated the tyre to a bit less than 40 psi and then there was a loud woosh from the tube and all the air decided it was time to leave - on removing the tube I would about a 24" rip in it it where it had catastrophically failed. Looking at the rip it pretty much runs down the middle of the tube so not on any seems but at one poitn does seem to touch the fold line of the tube where it was packed and the rubber there does show some signs of perishing so possibly that was the cause of the flat. So, the question is this, has any one actually tried it? and if so which inner tube did you use? I was wondering whether it might be better to use a latex tube as they're stretchier. I'm really keen to try this out as the change of tube is going to save in the region of 400grams of roatating weight which would be a most splendid thing however its probably not worth the effort if it isn't going to be fairly reliable. So if anyone as any thoughts post them as I'd be interested to here about others experience. Am off to the bike shop now to see if they have any other likely candidates onthe tube front Cheers Roland -- roland - Just a unicyclist ------------------------------------------------------------------------ roland's Profile: http://www.unicyclist.com/profile/5937 View this thread: http://www.unicyclist.com/thread/38845 |
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#2
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According to 'this' (http://tinyurl.com/6j5k9) thread, Tony has tried it and it worked. -- daino149 - On Vacation - till i find a job Check out my 'pics ' (http://www.unicyclist.com/gallery/daino) 'My X-a-n-g-a' (http://www.xanga.com/home.aspx?user=fingerpies) I need to find a job ------------------------------------------------------------------------ daino149's Profile: http://www.unicyclist.com/profile/933 View this thread: http://www.unicyclist.com/thread/38845 |
#3
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Tony Melton has tried it, raced it, and as far as I know, not had any problems with it. I think it should work with a regular big 700C tube, but a 29" tube might just give a bit more rubber contact. I still would recommend a tubeless conversion over using a 29"/700C inner tube though. More expensive, but it rides nicer and there is no chance of pinch flats, and also there's gloop to seal up small holes. Ken -- GizmoDuck - NZUNI o-kO 'www.adventureunicyclist.com' (http://www.adventureunicyclist.com/) ------------------------------------------------------------------------ GizmoDuck's Profile: http://www.unicyclist.com/profile/794 View this thread: http://www.unicyclist.com/thread/38845 |
#4
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-daino149 - -According to this thread, Tony has tried it and it worked.- My search did turn up this thread but I was lazy and didn't read it due to the title - thanks for flagging it up to me and I'll have more faith in the search function in future Thanks Ken for the recommendation on the tubeless conversion I'd read your posts on doing this and thought that it perhaps sounded a bit of a complex operationbut I might have more of a look into it although I don't really understand how it works and keeps the air in - time for a bit of research - you don't know what brand of tube Tony Melton is using do you? as I said before, the failure of the hutchinson tube that I had was fairly catastrophic jusdt about the time that it reached a suitable pressure but perhaps I was just unlucky Roland -- roland - Just a unicyclist ------------------------------------------------------------------------ roland's Profile: http://www.unicyclist.com/profile/5937 View this thread: http://www.unicyclist.com/thread/38845 |
#5
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Hi Roland, The tubeless conversion is not that complicated- I just measured the circumference of the Coker rim with a piece of string, emailed Stan who made me the rim strip. Stan might still have those measurements. Anway, he sent me all the stuff needed to put it together (rim strip, gloop and instructions), except I was too lazy to do that so I got my local bike shop to do it. They didn't have any problems- said it was straightforward as any other Stans Conversion Tony checks RSU quite frequently, so probably expect him to reply early in the week. Ken -- GizmoDuck - NZUNI o-kO 'www.adventureunicyclist.com' (http://www.adventureunicyclist.com/) ------------------------------------------------------------------------ GizmoDuck's Profile: http://www.unicyclist.com/profile/794 View this thread: http://www.unicyclist.com/thread/38845 |
#6
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I have been riding Coker with 700c WTB tube for 6 months. No problems to date. It made my wheel noticeably lighter. The weight reduction was most evident when accelerating and decelerating, but I even felt a 'swing weight' reduction when turning sharply. My Coker became more responsive. I recommend it. Installing the lighter tube began, for me, a bit explosively. When I finally got it all back together and pumped it up to 50-60psi -- BANG! After inspection I realized that I had pushed the rim strip aside and exposed sharp surface nipples that popped the tube upon inflation. I tried again, beginning the process by taping the rim strip in place with a single wrap of electrical tape. I overinflated the tube alone and stretched it a bit. Deflated it again and squished it in from the side. Finished installing the tire, inflated it, and began riding. It has been sweet ever since. (I also think tubeless would be great, both reducing weight and increasing performance, though I haven't tried it.) -- trailguy - uni is great ------------------------------------------------------------------------ trailguy's Profile: http://www.unicyclist.com/profile/8788 View this thread: http://www.unicyclist.com/thread/38845 |
#7
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My Coker with 29" inner tube is still going strong - no problems yet. I used either a WTB 29" inner or a Quality Bike Parts one. I needed a washer to adapt the valve hole from schrader to presta (standard schrader to presta valve adapters were too small for the hole.) A good quality rim tape helps. I don't know what rim strip standard Cokers come with, but it its a free rubber strip replace it with some wide rim tape (the stick-in-place type). Good luck Roland! Do a search for username Dirtsurfer and you'll find some more tubeless Coker threads. Dirtsurfer pioneered the tubeless Coker, I believe. +()\|- -- TonyMelton - Head in the clouds Issue Seven of ''One Track Mind'' (http://tinyurl.com/52nsh), Unicycle.com NZ's eNewsletter, is out now! ------------------------------------------------------------------------ TonyMelton's Profile: http://www.unicyclist.com/profile/2118 View this thread: http://www.unicyclist.com/thread/38845 |
#8
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Cheers for all the encouragement - I'm thinking that possibly my "explosion" may have been caused by getting som grit in between the tyre and the tub when I put the tyre in - so I'm going to get another tube and try the 700c route again. Might then have a look at the tubeless approach but the 700c tube version needs to be conquered first. I'll let you know how it pans out - I'm prepared to perevere for that weight saving Roland -- roland - Just a unicyclist ------------------------------------------------------------------------ roland's Profile: http://www.unicyclist.com/profile/5937 View this thread: http://www.unicyclist.com/thread/38845 |
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