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Old 11-26-05, 07:02 AM   #1
brunop
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what exactly makes a bike a tri-bike? seriously.

ok, i usually hang on the fixedgear forums but everytime i go to my favorite bike shop (harris cyclery in newton, ma) i go past a place 2 doors down that sells tri gear. the bikes are weird lookin'. big thick tubes and a huge seatpost. in all seriousness, what is all that about? why not just use a high-end road bike? i really am curious.

thanks.
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Old 11-26-05, 08:56 AM   #2
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Here's a good article on trinewbies.com that explains the difference:
http://www.trinewbies.com/Article.asp?ArticleID=11

In the end, it really boils down to the fun of owning two bikes and arguably being able to justify it to your wife.
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Old 11-26-05, 03:38 PM   #3
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Cant explain exactly what makes them faster (obviously aerodynamics) as I am no engineer or physics professor but I can tell you this bike makes me faster by 2mins+ then my road bike with 808's and aero bars over our clubs 18.5km TT course for the same effort.

Also carried me to a 2.27 bike in my first HIM. Pros were 10min quicker and I feel I could have gone 5min quicker but was holding back as it was my first and I didnt want to over do it.
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Old 11-26-05, 04:47 PM   #4
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List in order of significance

1. first is a steeper seat tube angle(76-82)
2. Lower head tube (as short as 9-10 cm integrated)
3. Shorter reach
4. Aerodynamic tubing and qualities
5. Shorter chainstays for better power transfer and to move rear wheel under body
5. Slacker head tube angle(around 72) to disperse weight better and keep a long wheelbase (the two 5s go together usually)

Besides that a different set of bars and a padded seat.

This is the general formula that companies are following these days.
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Old 11-26-05, 04:53 PM   #5
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I should expliain, what is truly significant about these specs is the change they make to ones position. 1-3 create a position that allows an open hip angle for good breathing and elbows that support your upper body weight comfortably.

A good position on a tri bike will save you about 3-5 minutes on a 40k time trial, funny because most people when being fitted put the seat back and about 5cms of spacers under their stem completely discarding the use of a tri bike. This is what differentiates a TT bike from a Tri bike, position.

Aero tubing and shaping will save you 1-2 minutes and wheels will give you 30-90 seconds.
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Old 11-26-05, 05:06 PM   #6
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what exactly differantiates A TT bike from tri bike?
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Old 11-26-05, 07:14 PM   #7
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Purely position, TT bikes typically refer to UCI regulated positions which must have the tip of the saddle 5cm behind the BB. Tri saddles typically sit over or in front of the BB. It's easier to get lower(less frontal area) if your seat is more forward.

The bikes themselves are seperated by seat angle. And there maybe rules on front-center differences.
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Old 11-27-05, 06:28 PM   #8
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tribike=faster ride, better run.
I love my tri bike, but that's what I use it for and nothing else.
I ride my road bike while training until a few weeks or so before my race then I hop on the tri bike. It's just not confortable for all the time riding/trainig.
plus, it is a reason to have more than one bike...or 2, or 4...
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Old 12-04-05, 12:50 AM   #9
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I'm not quite sure, but I think a tri bike is ridiculously fast/uncomfortable. Something like that.
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Old 12-04-05, 01:10 AM   #10
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"you are also putting less emphasis on your quadricep muscles." Which makes it easier to start running after the bike, I suppose.

Great article, I hadn't considered that apect of the tri bike.
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Old 12-04-05, 12:51 PM   #11
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