tubbies, pt's - define?

[cat-i]

what are deepsection tubbies ?

how do they differ from normal tyres - and how can you see, when the cyclist is out there riding, what type of tyres he's riding? do you swap the whole wheel for training/racing, or just the tyres?

 

and what on earth are PT's ?

[Overlord]

PT--------Power Tap. Shows you how much your power output is.

Deep Sections===Wheels with a deep profile ie: 40mm,50mm or more.

 

Zipp 404 Deep Section

Zipp 808 Deep Section The profile is just deeper.

 

www.zipp.com  Have a look at these wheels for an idea.

 

The "normal" wheels or box wheels or even other wheels do not have such a deep profile.

 

[cat-i]

k, thx onetime

 

my roadiebike also has deep section rims. why would i not train with them? i dont think i'm riding 'tubbies', though - i'd know if i'd had them, i guess?

 

what are tubbies? is that the specific tyres that you'd put on the rims? and would i have deep section tubbies to race with, and some other wheel to train with? or the same wheel, just with different tyres, which means that' i'd have to change tyres all the time?

 

power-tap - is that not something useful to train with?

 

 

 

[Minion]

 

Christie linked to one of the answers to why you wouldn't usually train with deep sections here:

https://www.bikehub.co.za/forum_posts.asp?TID=49880&PID=769871#769871

They also tend to be more expensive than normal wheels, so there're more problems if they're damaged.

 

Tubbies are tubular tyres. Here're some pictures showing the difference:

http://garynuke.homestead.com/tubular.html (NOTE: some of the 'facts' about the benefits of tubulars are wrong)

 

 

Edman2009-05-06 14:37:51

[Thug]

A deep section rim is more aerodynamic than box section rims that most road bikes come standard with and they'll be used more often during races.

 

Tubbies have their tube sewn into the tyre and are glued onto the rim as opposed to a normal clincher type tyre. Tubbie rims are tubbie specific and you can't use a normal tyre and tube. Conversely, you cant use a tubbie on a normal clincher rim as far as I'm aware.