Help with tube size

[Kenny202]

Just recently got a bicycle just for a bit of fun with the kids. Like a mountain bike hybrid thing with very thin road tires....Not even sure of the size of the bike but tyres are marked

700 x 28c / 28-622

 

Do those measurements just denote the tire size and the tube size may come in a few options or that indicates exactly the tube I need?

 

Just went to go out before and noticed the front tire has gone down a bit. I think its the old style dunlop valve where you unscrew the ring and you can pull the valve out / replace it. The ring was a little loose so maybe that's why some air came out. A few questions....

 

I used an adapter and my electric car tire pump and found I couldn't get the pressure much past 60....I think it should be closer to 100. It was ride-able but needed a tad more.

Its a decent electric pump. Do they not have enough grunt to overcome the valve over 50-60?

 

In any case I want to get a new tube and would prefer the Shrader / car type valve, simply because they are more common. I see most of these size tubes seem to have the Presta valves.

Are these skinny tubes available with Shrader valves or only Presta?

 

I see also when buying these tubes some have optional measurements of 40 / 48 / 60 / 80mm as well. Whats that about? Is that the length of the valve and why would that be important?

 

Can anyone recommend a decent brand of tube. I'm not doing the Tour de France....so don't want a 1000 baht tube. Just something mid range better and more reliable than a 40 baht  Lazada Hong Dong China special

 

By the way I am a pretty big guy over 110kg....is this size wheel too thin for me or should be ok? When I first bought the bike the tires were hard as a rock and felt ok. The guy actually said the rims would take fatter tires if I preferred them. Its only for general road riding, relaxation not racing. What would be the max size (width) tire I could go to?

 

 

Sorry for the dumb questions...clearly don't have a clue. Would appreciate someone taking the time to help or any advice 🙂

[scubascuba3]

the tube you'd get is a 700, usually they come in a range 23/25, 25/28 even 25/32, so anything which includes 28 in the range, i think a 28 tube would be about 80 psi, i use 25s and have 100 psi

[Kenny202]

Thanks bro. These Presta valves....do you need a special bike pump? My car electric pump wont put much more than 60PSI in my Dunlop valve tube

[scubascuba3]

12 minutes ago, Kenny202 said:

Thanks bro. These Presta valves....do you need a special bike pump? My car electric pump wont put much more than 60PSI in my Dunlop valve tube

Most floor pumps do both, Decathlon have good ones, Mr DIY sell them or Lazada/Shopee as usual

[Centigrade32]

5 hours ago, Kenny202 said:

Just recently got a bicycle just for a bit of fun with the kids. Like a mountain bike hybrid thing with very thin road tires....Not even sure of the size of the bike but tyres are marked

700 x 28c / 28-622

 

Do those measurements just denote the tire size and the tube size may come in a few options or that indicates exactly the tube I need?

 

Just went to go out before and noticed the front tire has gone down a bit. I think its the old style dunlop valve where you unscrew the ring and you can pull the valve out / replace it. The ring was a little loose so maybe that's why some air came out. A few questions....

 

I used an adapter and my electric car tire pump and found I couldn't get the pressure much past 60....I think it should be closer to 100. It was ride-able but needed a tad more.

Its a decent electric pump. Do they not have enough grunt to overcome the valve over 50-60?

 

In any case I want to get a new tube and would prefer the Shrader / car type valve, simply because they are more common. I see most of these size tubes seem to have the Presta valves.

Are these skinny tubes available with Shrader valves or only Presta?

 

I see also when buying these tubes some have optional measurements of 40 / 48 / 60 / 80mm as well. Whats that about? Is that the length of the valve and why would that be important?

 

Can anyone recommend a decent brand of tube. I'm not doing the Tour de France....so don't want a 1000 baht tube. Just something mid range better and more reliable than a 40 baht  Lazada Hong Dong China special

 

By the way I am a pretty big guy over 110kg....is this size wheel too thin for me or should be ok? When I first bought the bike the tires were hard as a rock and felt ok. The guy actually said the rims would take fatter tires if I preferred them. Its only for general road riding, relaxation not racing. What would be the max size (width) tire I could go to?

 

 

Sorry for the dumb questions...clearly don't have a clue. Would appreciate someone taking the time to help or any advice 🙂

 

The figure represent the tyre size. 28 is the width of the rim in millimetres. You might have issues getting a bigger tube to fit into that tyre. The bigger tyre/tube sizes are for bikes with wider rims on the wheels. Do you have an adapter for Presta valves?

Otherwise: https://shopee.co.th/product/10400640/1781274731

 

[NoDisplayName]

5 hours ago, Kenny202 said:

700 x 28c......big guy over 110kg

Should be fine on pavement, if you don't hit any potholes or rocks.  Won't be comfortable though.  Wider tires will be cushier.  Goggle the specs for the rim, that should give you the max width.  Hopefully, more like a 700x35 or even 38.  Pick a tube (they usually come with a size range) that matches the tire.

 

5 hours ago, Kenny202 said:

couldn't get the pressure much past 60....I think it should be closer to 100

 

Should be stamped on the tire sidewall.  As to the pump, is yours rated for high-pressure?  MTB type won't pump up the thin, HP tires.  I suppose a 12v plug in for 38psi car tires would struggle, as well.

 

5 hours ago, Kenny202 said:

want to get a new tube and would prefer the Shrader / car type valve

 

If you had a rim drilled for shraeder, you could get an insert adapter to use skinny presta tubes.  It's possible to drill out a presta rim for shraeder, but.......

 

5 hours ago, Kenny202 said:

these tubes some have optional measurements of 40 / 48 / 60 / 80mm

 

That should be the stem length.  Rims come in a variety of shapes, with the aerodynamic v-type requiring a much longer stem.