Polyurethane Inner Tubes

Postby great uncle bulgaria on Thu 2/Dec/10 11:26pm

Road
are they any real advantage?
are they repairable?

Advice appreciated. :)
great uncle bulgaria
User avatarMedal
""misunderstood and persecuted""
Member for: 4 years 1 month

Re: Polyurethane Inner Tubes

Postby Oli on Thu 2/Dec/10 11:35pm

No advice, but I do have a joke: What do you call it when a parrot has a wee?





Polyurinate... :D
Oli
User avatar
Member for: 9 years 3 months

Re: Polyurethane Inner Tubes

Postby Oli on Thu 2/Dec/10 11:37pm

Actually, I do remember such tubes from a time long ago - at the time they seemed hard to puncture, but were heavy and prone to splitting at the seams from time to time. Also a bitch to patch. Stupid things, IIRC. :hmmm:

Are they available again? They may be much better now of course. :thumbsup:
Oli
User avatar
Member for: 9 years 3 months

Re: Polyurethane Inner Tubes

Postby great uncle bulgaria on Thu 2/Dec/10 11:46pm

bought a couple about 5 years ago in a fit of . . . GOK what (easy way to loose weight :blush: )
lighter, supposedly less rolling resistance.
One punctured 10k into a race last week (in brand new tyres on a country road - tubes stored as per instructions)
not sure whether to biff it, fix it or replace it (and whether to biff its partner that remains in the other (race) wheel.
I suspect they're of little real value and a hassle to fix - thought someone might know . . .




(three parrots weeing >>poly-polyurinate)
great uncle bulgaria
User avatarMedal
""misunderstood and persecuted""
Member for: 4 years 1 month

Re: Polyurethane Inner Tubes

Postby Oli on Thu 2/Dec/10 11:58pm

Nope. Don't like that one. :(
Oli
User avatar
Member for: 9 years 3 months

Re: Polyurethane Inner Tubes

Postby ThingOne on Fri 3/Dec/10 6:36am

great uncle bulgaria wrote:bought a couple about 5 years ago in a fit of . . . GOK what (easy way to loose weight :blush: )
lighter, supposedly less rolling resistance.
One punctured 10k into a race last week (in brand new tyres on a country road - tubes stored as per instructions)
not sure whether to biff it, fix it or replace it (and whether to biff its partner that remains in the other (race) wheel.
I suspect they're of little real value and a hassle to fix - thought someone might know . . .




(three parrots weeing >>poly-polyurinate)



Did you mean Latex tubes?..
ThingOne
User avatar
"www.bushloveracing.com"
Member for: 7 years 8 months

Re: Polyurethane Inner Tubes

Postby Al_Bushman on Fri 3/Dec/10 7:56am

Can you get strawberry flavoured ones?? :eh:
Al_Bushman
User avatar
Member for: 8 years 5 months

Re: Polyurethane Inner Tubes

Postby FLATULENTFRIEND on Fri 3/Dec/10 9:20am

Al_Bushman wrote:Can you get strawberry flavoured ones?? :eh:


Or ribbed for umm….cyclo-cross? ;)
FLATULENTFRIEND
User avatar
"I'm a Sponsored rider; My Wife Pays me to get out of the house!"
Member for: 6 years 1 month

Re: Polyurethane Inner Tubes

Postby great uncle bulgaria on Fri 3/Dec/10 10:18am

ThingOne wrote:
Did you mean Latex tubes?..


they feel like latex but the box says polyurethane.

appear to be mint flavoured :p due to green color but I haven't actually tasted them yet
not ribbed but the big metal thing in one place may create some very different sensations I'm sure :blink:
great uncle bulgaria
User avatarMedal
""misunderstood and persecuted""
Member for: 4 years 1 month

Re: Polyurethane Inner Tubes

Postby danose on Fri 3/Dec/10 10:35am

great uncle bulgaria wrote:they feel like latex but the box says polyurethane.


old panaracer greenlites?

this post (with data from TOUR's tests) seals it for me - I've run conti supersonics for years and they seem really reliable for a 50g tube :thumbsup: Back when you couldn't get light butyl tubes latex may have been worthwhile but now not worth the fragility
danose
User avatar
"I've never met a hill I didn't like"
Member for: 10 years 6 months

Re: Polyurethane Inner Tubes

Postby great uncle bulgaria on Sun 5/Dec/10 11:45pm

danose wrote:
great uncle bulgaria wrote:they feel like latex but the box says polyurethane.


old panaracer greenlites?

this post (with data from TOUR's tests) seals it for me - I've run conti supersonics for years and they seem really reliable for a 50g tube :thumbsup: Back when you couldn't get light butyl tubes latex may have been worthwhile but now not worth the fragility



yeah. Panaracer green lites

but I'm unsure that polyurethane and latex refer to the same thing.
i thought latex was a type of rubber and polyurethane a synthetic.

unless in bicycle tyre terminology they are used to refer to the same thing??

either way they are about the same weight as supersonics and offer no advantage there - Still i wonder if there is a rolling resistance difference ? What are the TOUR data?
great uncle bulgaria
User avatarMedal
""misunderstood and persecuted""
Member for: 4 years 1 month

Re: Polyurethane Inner Tubes

Postby Oli on Sun 5/Dec/10 11:52pm

They are definitely different things, even in cycling parlance.
Oli
User avatar
Member for: 9 years 3 months

Re: Polyurethane Inner Tubes

Postby feddydafish on Mon 6/Dec/10 8:31am

great uncle bulgaria wrote: - Still i wonder if there is a rolling resistance difference ? What are the TOUR data?


Ok, call me stupid (and I'm sure you will), but for the benefit of a layman, how on earth does the tube INSIDE your tyre affect the rolling resistance??
feddydafish
User avatar
Member for: 4 years 4 months

Re: Polyurethane Inner Tubes

Postby slidecontrol on Mon 6/Dec/10 8:40am

something to do with how the tube can flex and move inside the tyre. I have no reliable data, but all my TT pbs have been set using latex tubes instead of butyl. I like to believe I can feel a difference too.*

*if only to justify the extra cost
slidecontrol
User avatar
"YOLO = carpe diem for idiots"
Member for: 7 years 7 months

Re: Polyurethane Inner Tubes

Postby danose on Mon 6/Dec/10 10:14am

great uncle bulgaria wrote:but I'm unsure that polyurethane and latex refer to the same thing.
i thought latex was a type of rubber and polyurethane a synthetic.


nah - polyurethane is totally different (chemically) and you can see/feel the diff between a poly tube and latex. Poly never seemed to catch on - as you found they make latex tubes seem robust. Ironically they found pretty much the same thing with condoms (few companies make poly condoms for people who are latex allergic) :D

like I said, now you can get trully light butyl rubber tubes latex/poly seems a waste of time - if you're really chasing min rolling resistance you'll be on tubs anyway, otherwise you're arguing about a 2w diff between latex and conti supersonics which ain't diddly

forgot to post the bloody link - here it is : http://weightweenies.starbike.com/forum ... &view=next
danose
User avatar
"I've never met a hill I didn't like"
Member for: 10 years 6 months

Cycling | Road Cycling - Latest Posts

Who is online

63 Users browsing this website: Exabot [Bot], Google [Bot], Google Adsense [Bot], phantasim, Slim, swtchbckr, Yahoo [Bot] and 50 guests

VORB SUPPORTERS


  • Vorb Shop
  • Butterfly Customs
  • GT Bicycles