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crikey - MemberOne would assume that with all the aero and weight advantages available these days, that TT records would be tumbling every week...
Kidding? Minimum weight limit. And ask Obree about aerodynamic advantages.
The TT carbon bike is more aerodynamic, and aerodynamics trumps weight, unless you're climbing at slow speed. If you lose body weight the reality is it will come with increased fitness, so losing a pound of body weight is always better than losing a pound of bike weight. A pound off your bike is dead weight. A pound off your body comes with additional benefits in fitness.
Upgrading bikes and kit is just nice. Full stop. Nothing to do with achieving tangible and noticeable benefits. No need to justify it. If you want it, and can afford it, and get it past your other half, fill yer boots!
The average person is carrying about 70,000 calories of lard, so plenty of poundage to be going at before you start chasing grams off your bike justifying that its better to lose weight off the bike. Unless you're sub 10% body fat that justification just doesn't stick!
neither bike are tt, just plain vanilla sit up an beg road bikes. in fact carbon has BIG tubes so probably lot less aero than 1" headtube steel bike.
Wheels do make a difference, lighter wheels definitely make it easier.
But generally i would agree an xtr rear mech is not going to make you faster unless you are <10% body fat
but some parts do count. In fact I'd say properly set up trail suspension is often heavier than XC parts and that would probably make the average rider faster
wobbliscott - MemberIf you lose body weight the reality is it will come with increased fitness
What a ridiculous oversimplification. Lose muscle, lose weight.
"Don't buy upgrades; ride up grades". - Eddy Merckx
EAT LOADS OF PROTEIN, EAT LOADS OF VEG (NOT POTATOS, PASTA OR BREAD) STAY OFF THE BOOZE. DO THIS FOR 6 MONTHS AND YOU WILL BE A ****ING SLIM BORING HEALTHY MONK.
My totally non scientific research suggests that for every pound less of bike weight I can do a lap of Cannock a minute quicker. 5lbs saves 5 minutes. Not lost any body weight so maybe that's the way forward