General Discussion Triathlon Talk » To Change tires / tubes or not Rss Feed  
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2017-03-03 7:12 PM

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Subject: To Change tires / tubes or not
Most of my riding is done on indoor trainer ~ 85-90%.

I keep a separate bike on trainer , my race tri bike sees little action. I purchased new tires tubes about 8 months ago for my outdoor tri bike , probably less than 400 overall miles on them. Will put an additional couple hundred outdoor miles this month

Half iron galvestion coming up in a month - should I change tires prior, or is it over kill? My goal is to reduce chance of flatting.

I keep my tri bike out in the garage , it's fairly humid - houston area.

Appreciate your input also any recomendation on fast flat averse tires are always welcome

Current tires are specialized roubaix.


2017-03-03 7:43 PM
in reply to: #5214959

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Subject: RE: To Change tires / tubes or not
I would just inspect the tires for any puncture holes or cracks in the side wall. If anything, you would probably pop a tube. For $6 each, I would replace the tubes to be safe.

Just my $0.02
2017-03-03 11:15 PM
in reply to: Jeff B

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Subject: RE: To Change tires / tubes or not

tires are fine, put in latex tubes.

2017-03-04 7:31 AM
in reply to: Stuckinthemiddle

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Subject: RE: To Change tires / tubes or not
Originally posted by Stuckinthemiddle

Appreciate your input also any recomendation on fast flat averse tires are always welcome

Current tires are specialized roubaix.


Here there is an article on rolling resistance
http://bikeblather.blogspot.ca/

Here is the spreashsheet with results
https://docs.google.com/spreadsheets/d/1qQrXymedOYtKfRKwIDpaxvfCac6J...


Down near the bottom you will find the Roubaix pro. It needs 29watts at 30km/h just to overcome rolling resistace

A tire such as the GP4000s requires 21watts and you will find other tires that require a bit less but that may make compromises on puncture proofness

That's 8watts. That's about 5% of a 160w which is what many beginner cyclists have their threshold at and what many MOPers race a half at.

As stated, latex tubes will buy you another few watts.

Do the math and you will come out to a couple of minutes on a HIM.
2017-03-04 12:18 PM
in reply to: marcag

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Subject: RE: To Change tires / tubes or not
Originally posted by marcag



Down near the bottom you will find the Roubaix pro. It needs 29watts at 30km/h just to overcome rolling resistace

A tire such as the GP4000s requires 21watts and you will find other tires that require a bit less but that may make compromises on puncture proofness

That's 8watts. That's about 5% of a 160w which is what many beginner cyclists have their threshold at and what many MOPers race a half at.

As stated, latex tubes will buy you another few watts.

Do the math and you will come out to a couple of minutes on a HIM.




8 watts is huge for me. Do latex tubes generally hold up as well as butyl (?) in bumpy conditions? There are some bumpy patches on the galvestion 70.3 as I understand it.

That might be the way to go,,, get some new tires/tubes for the race season then put the current tires on my trainer rig. It eats tires like candy
2017-03-04 12:21 PM
in reply to: Stuckinthemiddle

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Subject: RE: To Change tires / tubes or not
Originally posted by Stuckinthemiddle

Originally posted by marcag



Down near the bottom you will find the Roubaix pro. It needs 29watts at 30km/h just to overcome rolling resistace

A tire such as the GP4000s requires 21watts and you will find other tires that require a bit less but that may make compromises on puncture proofness

That's 8watts. That's about 5% of a 160w which is what many beginner cyclists have their threshold at and what many MOPers race a half at.

As stated, latex tubes will buy you another few watts.

Do the math and you will come out to a couple of minutes on a HIM.




8 watts is huge for me. Do latex tubes generally hold up as well as butyl (?) in bumpy conditions? There are some bumpy patches on the galvestion 70.3 as I understand it.

That might be the way to go,,, get some new tires/tubes for the race season then put the current tires on my trainer rig. It eats tires like candy


I did Galveston once and I didn't find it particularly bumpy. But anyways, latex holds up just fine. Some people say they are more temperamental to install which I never found. I inflate them slightly before putting them on the rim and I never broke them


2017-03-06 1:33 PM
in reply to: marcag

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Subject: RE: To Change tires / tubes or not

I think Galveston is pretty normal, road wise (raced alongside Marc a couple years back - waves).  I ran 4000s's and don't recall being concerned about the surface.

For the trainer, though, I'd strongly recommend a trainer tire.  They're not that expensive and if you already keep a dedicated trainer rig, you'll be able to just run that tire for a loooooooong time.  I have a few thousand "miles" on my current trainer tire (on a wheel from an old bike) and it's still going like a Timex (hope that's not too anachronistic a reference).

They can be something of a beatch to install, is all (I'm still procrastinating putting one on my wife's bike).

Matt

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