Where are you guys getting your tubes

[Kyouma]

Hey guys, I'm looking for tubes to carry around with me and I'm having issues getting the right size and where to get them they all seem smaller than what I need. Just wondering what sizes you guys are using, sorry, first time with a tube bike. 

Thanks, 
IG

[Landshark]

I get mine at the local bike shop.  The tubes that I buy will fit several sizes of tire regardless of what brand I buy.  I don't but the heavy duty tubes as they are not intended for highway use.  You may find it difficult to find tire tubes in this economic stupidity we're experiencing.  Good luck.

[tenerecanada]

I have always used Michelin Ultra Heavy Duty Tubes, but if you are a road warrior as Landshark suggested you may want to be careful. That being said I am on my third  140/80/18 rear tire and have about 15,000 km on my current tubes. While trying to avoid tarmac, I have definitely rode that one on a few thousand kilometers of spirited road riding.

 

Michelin Offroad Tubes

18" Type E = UHD LARGE - Valve TR4, 140/80-18 (P/N - 89343)

21" Type B = UHD - Valve TR4, 90/90-21, 80/100-21 (P/N - 73810)

(Fortnine.ca has both in stock FYI)

 

Someone correct me if I am wrong but I would assume you should be fine fitting a 140/80-18 tube into the stock rear setup with a 150/70/18. It may even come with that size, I am not sure.

[Ray Ride4life]

What is the reason the heavy duty tubes are not for road use?
Sadly i have to ride a lot on paved roads. My daily commute is 30km and in the morning i don't have time to take the fun route and even the fun route is just about 30% offroad.
I also do long trips on which the majority is paved but still a lot offroad on my next trip and i don't know what i will come across, also not likely to turn around when it gets a bit more difficult or rough so a HD would be nice.

 

[tenerecanada]

I'm pretty sure it is a heat transfer problem, more rubber to hold more heat longer, helping break the the tubes down faster - may lead to total failure. I have heard of this concern before but have been willing to run this risk with no problems (so far.)