I know very little about bicycles and I'm trying to help friend who knows even less. Tire is marked 700 x 28C. I think I've identified the valve type as Dunlop but from the attached photo, it should be clear enough to anyone who knows their stuff. Note also that my fingernail is at the edge of the rim so it looks like this is a deep rim needing a long valve.

When I go online, all I can seem to find is tubes with Presta type valves. Perhaps I don't know where to look. If this innertube/valve combo is not readily available in TL or likely to be unreasonably expensive, could the rim opening accept a Schrader type valve or a Presta with an appropriate adapter? I'm not even sure that Schraders are made long enough to suit this rim although I'm assuming Presta wouldn't be a problem. Finally if there is no easy solution or the appropriate inner tubes might be far more expensive long term, perhaps ditching the wheels for more conventional type might be a better solution. Thanks.

10 minutes ago, csaba81 said:

Note also that my fingernail is at the edge of the rim so it looks like this is a deep rim needing a long valve.

 

The inner tube sits in the  rim to where the spokes end  so a long valve is not required,  and the valve in the photo looks like a standard Schrader valve to me the other type are much thinner  like the adaptor that is screwed to the top in the photo.

3 hours ago, johng said:

 

The inner tube sits in the  rim to where the spokes end  so a long valve is not required,  and the valve in the photo looks like a standard Schrader valve to me the other type are much thinner  like the adaptor that is screwed to the top in the photo.

 

Thanks for the reply. When I remove that 'adapter' you get what you see in the first photo below, namely a smaller threaded tube sticking out of what looks like a Schrader. However, that smaller tube doesn't look like it can be removed. What it looks like to me is the Dunlop in the second photo below. 

I have seen Schrader valves with thread all the way down

but don't know what your photo shows.

 

Could you remove the inner tube entirely from the rim and post a good photo someone else is sure to know.

8 minutes ago, csaba81 said:

 

Thanks for the reply. When I remove that 'adapter' you get what you see in the first photo below, namely a smaller threaded tube sticking out of what looks like a Schrader. However, that smaller tube doesn't look like it can be removed. What it looks like to me is the Dunlop in the second photo below. 

 

To save any more heartache:

 

Dunlop (Woods) and Schrader valves are interchangeable because they share the same nominal hole size of 8mm in the rim, allowing for a tube with either valve to fit. This means you can replace a Dunlop tube with a Schrader tube and vice-versa.

4 hours ago, csaba81 said:

online, all I can seem to find is tubes with Presta type valves. Perhaps I don't know where to look. If this innertube/valve combo is not readily available in TL or likely to be unreasonably expensive,

Decathlon have them online or at their shops for 200bht.

Hardly expensive.

Presta or Schrader will fit.

https://www.decathlon.co.th/en-TH/p/700x23-32-48-mm-presta-valve-inner-tube-decathlon-8544668.html

Lazada or Shopee about 70 baht

Not quite 70 baht. From 78 baht. 

 

700x23/28 FV48/60/80mm are the options to choose. The mm figure is the length of the valve. Measure the one you have now.

 

https://shopee.co.th/product/222574838/5181659049

 

https://shopee.co.th/ยางในจักรยาน-CHAOYANG-BICYCLE-INNER-TUBE-ขนาด-20-24-26-700c-29-คุณภาพดี-i.222574838.5181659049

 

Name brands:

 

https://shopee.co.th/product/12686044/8355928479

http://www.bangnabicycle.com/product/299/ยางใน-schwalbe-700c-x-18-28-จุ๊บเล็กยาวพิเศษ-60mm

https://www.lazada.co.th/products/bontrager-700c-x-28-32-bike-inner-tube-presta-48mm-i4425424579-s17700725094.html

 

If you put a Presta valve tube in, put a ring nut all the way down to the base of the valve, to sit inside the whole, to stop the edges of the hole cutting the rubber at the bottom of the valve.  You won't be able to do that, if the valve is not threaded all the way down

 

SC