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@hippy
HR falls, but what of her power output?
Shimano make a DA TT-specific chainrings up to a 56.
http://www.benscycle.net/index.php?main_page=product_info&cPath=75_128_597&products_id=3021&zenid=1a68b6c92219792a2b5f581ce971999a
FSA do K-Force in [FONT=Arial]53, 54, 55T [/FONT]
and these up to 56T
Also the current BBAR champ runs a custom made 77T chainring! He also prefers lower cadences.
http://www.cyclinginnovations.com/tisoproddtttchnrg.php
Available in 53, 54, 55 and 56
FSA Neo Pro MegaExo TT Crankset & Ceramic Bearing Bottom Bracket $700USD
Stronglight Krono from Ribble
http://www.ribblecycles.co.uk/productdetail.asp?productcatalogue=STROCHRI400
up to 55T
SRAM do some..
