Cycling and bicycle discussion forums. 
   Click here to join our community Log in to access your Control Panel  


Go Back   > >

Bicycle Mechanics Broken bottom bracket? Tacoed wheel? If you're having problems with your bicycle, or just need help fixing a flat, drop in here for the latest on bicycle mechanics & bicycle maintenance.

User Tag List

Reply
 
Thread Tools Search this Thread
Old 06-05-07, 07:44 AM   #1
rdw72777
Newbie
Thread Starter
 
Join Date: Jun 2007
Location: Philadelphia
Bikes: Giant OCR2
Posts: 1
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Tire Size/ Tube Size Question

Howdy all,

At this point I'm sure most of you knowledgeable riders enjoy answering this tire size/tube size question. Some day this will all make sense to me, hopefuly today!!

My bike is a Giant OCR2 road bike, ridden on pavement 99.9% of the time with minimal bumps/ruts in the road or on the paved paths I ride.

Anyways, I encountered a rapidly flattening tube last night. The hole is big enough that I don't want to repair it and besides I have the Philly tri later this month so why not put a new tube in. My question is, my tire is a 700X26C, and the tube that was in there was a 700X28/35. I bought a replacement (Specialized) tube that is 700X20/28 (27 3/4 - 1 1/8) tube. Now I'm pretty sure that the new tube is acceptable as a replacement (although let me know if not), but just wondering why my bike shop would have put the 700x28/35 on when they fixed my last flat? Isnt that size a little big? Is there a reason a tube slightly bigger than the tire would be better.

Also, I'm a big guy (250 pounds). Is there an advantage to using one of these (28/35 vs. 20/28) tires for someone my size? Does one have a higher/lower risk of damage at high air pressures with someone of my size on it?

Thanks,

Ryan
rdw72777 is offline   Reply With Quote
Old 06-05-07, 09:15 AM   #2
FlatFender
Senior Member
 
FlatFender's Avatar
 
Join Date: Aug 2006
Location: Raleigh NC
Bikes:
Posts: 1,007
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
no advantage, no disadvantage.
Both tubes are fine.
FlatFender is offline   Reply With Quote
Old 06-05-07, 09:39 AM   #3
Wordbiker
Pwnerer
 
Wordbiker's Avatar
 
Join Date: Jun 2005
Location: Pagosa Springs, CO, USA
Bikes: Road, MTB, Cruiser, Chopper, BMX
Posts: 2,907
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
The closer a tube is to the tire size, the less it stretches to fill the tire volume, and therefore is more puncture resistant. Granted, the difference is minimal, and you can flat with nearly anything, but that's the theory anyway. The thorns/glass/bits of metal don't seem to care what your tube size is.

As a racer I used to run a size smaller to reduce rolling weight. Seems a bit silly now as a flat will lose you more time than a weight advantage gains you.
__________________
Quote:
Originally Posted by ahsposo View Post
Ski, bike and wish I was gay.
Wordbiker is offline   Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off



All times are GMT -6. The time now is 11:08 PM.