I ride 4 times a week and I never do any warm ups. I'm usually running at 20 mph within two minutes of starting. I experience no ill effects at all. Just lucky I guess, especially for an old fart.
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'00 TiSports Titanium - DA 9 speed------ '01 KHS Flite 800 - DA/Utegra 9 speed mix
‘02 Ellsworth Flight - Ultegra 10 speed -.'03 Basso Coral - Ultegra 10 speed
'03 Specialized Allez Pro - DA 10 speed .'04 Scattante CFR Limited - DA 9 speed
'05 KHS Flite 2000 - Ultegra 9 speed -... '06 Flyte SRS-3 - DA 9 speed-------
'05 Serotta Fierte - Utegra 10 speed--..-'07 Pedal Force RS - SRAM Force