Diameter of wheels of "Ironman" bikes
Diameter of wheels of "Ironman" bikes
(OP)
Was there a specific reason(s) for the change from 650 cm to 700 cm diameter?
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Diameter of wheels of "Ironman" bikes
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RE: Diameter of wheels of "Ironman" bikes
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RE: Diameter of wheels of "Ironman" bikes
USAT Link
British Tri Link
RE: Diameter of wheels of "Ironman" bikes
RE: Diameter of wheels of "Ironman" bikes
“Triathlon bikes are designed with a different geometry than road bikes. Triathlon bikes are more forward in their seat tubes (between 75-78 degrees) and are set up lower in the front end to provide a time trial position. A steeper seat tube angle emphasizes the quads more to save the use of your run muscles so that you have more get up and go when you start the run portion of a triathlon. Triathlon bikes come in 650c or 700c wheel sizes. 650c wheels accelerate better and are lighter, having less surface area exposed to the wind than 700c wheels. They are more proportional to riders under 5'10''. 700c wheels have long been the standard in the bike industry. Although slightly larger, 700c wheels offer more comfort and less rolling resistance than 650c wheels and are more proportional to riders over 5'10''. Regular road bikes have a more slack seat tube angle, from 72-74 degrees, and are set up for all-purpose riding. They are designed to corner, climb, and sprint well. The road bike position is more upright and less aerodynamic than a time trial position. A road bike position uses all of the leg muscles to provide as much power to the bike as possible.”
There are still plenty of Tri specific bikes being made with the smaller wheels. The guy at the bike shop didn't know what they were talking about.
RE: Diameter of wheels of "Ironman" bikes
Thank you for all the info. It was very insightful. However, this was a quote from a "pro" bike shop, and he told me that, as far as he knows, all tri-bikes are now being made with BOTH wheels 700 cm. I am not a triathlete, but was wondering about this issue because I have a tri-bike that I ride once in while.
I also asked him about time-trial bikes, such as ridden in the Tour. He said it is very common for the front wheel to be 650 cm, and the rear 700 cm.
Next time an Ironman event comes up, I am going to investigate this further.
RE: Diameter of wheels of "Ironman" bikes
I did not have any success researching this issue on the Web, but I did call another "pro" shop, and, as you said, the 650 cm wheels are still being made - but in much fewer quantities.
Thank you again for the info.
RE: Diameter of wheels of "Ironman" bikes
RE: Diameter of wheels of "Ironman" bikes
Roadies have a high degree of snobbiness, yes. Especially sprinting champions from Italy. I used to subscribe to the now-defunct Road Bike (?) magazine, and it was amusing to read about all their prejudices and taboos, such as one should never fit a carrying pouch under the saddle, etc.
As I said, I found a bike shop more to my liking, near to my home. I can't swim or run, but would like to get back on the tri-bike to do some short trips out on a nice clean road.
My road bike (really a "Crit" bike") is fitted with heavy tires and inners, and is now used purely for commuting to work on city streets littered with broken glass and gravel.
RE: Diameter of wheels of "Ironman" bikes