Deep Section Posted April 20, 2009 Posted April 20, 2009 I have been wanting to do a inexpensive tubeless conversion for a while now. I have all the bits and bobs but i am in need of the main ingredient a 20inch BMX tube with a removable presta valve. I have called 10 shops in Cape Town but they all give me the same answer "20inch BMX tubes only come in a car valve" Can anyone advise me on where i can buy these tubes from? Thanks in advance
NotSoBigBen Posted April 20, 2009 Posted April 20, 2009 They definitely do come with Presta, I have done quite a few conversions but I have never found the ones with a removable core .......
Deep Section Posted April 20, 2009 Author Posted April 20, 2009 They definitely do come with Presta' date=' I have done quite a few conversions but I have never found the ones with a removable core .......[/quote'] Hi BigBen, It's your post that inspired me to try the conversion. Where did you get your skinny valves from and what make were they?
NotSoBigBen Posted April 20, 2009 Posted April 20, 2009 Cool, my training bike that has quite a lot of km's/hours on has that conversion and I have had no problems at all! Not sure what make they were but I will check tonight. Got them from my LBS (Just cycles - Alberton) here in Howteng!
Deep Section Posted April 20, 2009 Author Posted April 20, 2009 Schwalbe makes one with a removable core I have called the importers of Schwalbe tubes and they don't bring in any 20inch tubes. On CRC website it comes to over R200.00 for 2 tubes ( I am want to do it an inexpensive way). In this case Local will be cheaper.
Deep Section Posted April 20, 2009 Author Posted April 20, 2009 Cool' date=' my training bike that has quite a lot of km's/hours on has that conversion and I have had no problems at all! ? Not sure what make they were but I will check tonight. Got them from my LBS (Just cycles - Alberton) here in Howteng![/quote'] cool, am looking forward to your reply
KDEE Posted April 20, 2009 Posted April 20, 2009 Most BMX tubes with Presta valves ( not even going the removable core route here ) are made for BMX racing wheels in sizes 20 by 1 1/8 and 1 3/8... these will be plenty wide enough for a tjoopless conversion.. Finish Line in Kempton Park... ( will post to CT ) Cycle Fusion in Weltevreden Northcliff cycles in Northcliff all have stock..
Mudsimus Posted April 20, 2009 Posted April 20, 2009 Easy. Cut a strip from a 20" tube. But use the piece without the valve. Install the strip over the rim. Then cut a valve from an old road bike tube. Remove most of the rubber around the tube leaving only a little, like on a real tubless valve. Then simply make a small hole in the strip you installed and press the valve trough. Use that silly little nut you get with the road bike tube to tighten it. Now you've got a homemade conversion with a removeable valve, wich is great if you need to put in a tube.
Deep Section Posted April 20, 2009 Author Posted April 20, 2009 Easy. Cut a strip from a 20" tube. But use the piece without the valve. Install the strip over the rim. Then cut a valve from an old road bike tube. Remove most of the rubber around the tube leaving only a little' date=' like on a real tubless valve. Then simply make a small hole in the strip you installed and press the valve trough. Use that silly little nut you get with the road bike tube to tighten it. Now you've got a homemade conversion with a removeable valve, wich is great if you need to put in a tube.[/quote'] Will have to try this
Johan Bornman Posted April 20, 2009 Posted April 20, 2009 I did a conversion for someone over the weekend and we used Schrader valves. I did some deep thinking and when the smoke cleared, came to the conclusion that tubeless conversions are a very good reason to go to Schrader. The valves can always be screwed out, they can be purchased anywhere in the world for next to nothing, the valve tool is freely available and the stem is thick enough to pour the goo in through a funnel.What's the obsession with Presta then?
Jules Posted April 20, 2009 Posted April 20, 2009 I did a conversion for someone over the weekend and we used Schrader valves. I did some deep thinking and when the smoke cleared' date=' came to the conclusion that tubeless conversions are a very good reason to go to Schrader. The valves can always be screwed out, they can be purchased anywhere in the world for next to nothing, the valve tool is freely available and the stem is thick enough to pour the goo in through a funnel. What's the obsession with Presta then? ?[/quote'] Perhaps they don't want to drill their rim wider?
Johan Bornman Posted April 20, 2009 Posted April 20, 2009 Perhaps they don't want to drill their rim wider? Jules, like I said, I did DEEP thinking. I thought of that too. What's the big deal with that? 70% (a purely made-up statistic) of sub R15k mountain bikes come with Schrader valves in anyway. On my bike, I drilled the inside wall of the rim bigger than a Presta strictly requires, so that I can get rid of that silly bulge and have the valve seat deeper and evenly.
Serendipity Posted April 20, 2009 Posted April 20, 2009 My Mavic rims came with a plastic insert that can be removed to fit Schrader or left in place for presta. I also can't see a reason for going presta. The added bonus is, if you do flat in a race, and someone throws you a tube, it will fit. That is not always the case if you run presta. I had that happen to me once when I was still running presta valves.
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