Having a lighter bicycle will save you energy every time you ride uphill. A light bike is also desirable in road races and criteriums where you will need to accelerate frequently in response to attacks. Having a lighter bike is better. This assumes that the light weight is achieved without adversely sacrificing the strength, stiffness, durability or safety of the component.
Of all the places where weight can be saved having lighter wheels will offer the greatest benefit. Fortunately lightweight tubes, tires and rim tapes are also one of the least expensive places to reduce weight. Many off the peg bikes will be specced with cheap wire bead clincher tires weighing in excess of 300g, oem rubber rim strips weighing over 30g each and inner tubes weighing over 100g each. Good quality clincher tires are available weighing less than 200g, tubes are available weighing 55g and rim tapes from 6g. Combined savings of over 300g of rotational weight compared with most OEM set ups are available.
In 2000 the UCI introduced a minimum bike weight of 6.8kg for road and TT bikes which is approximately 14.96lbs. Now its possible to buy a complete off the peg bike under this weight to which you'll need to attach weights if taking part in any races. Of course not everyone wants to race and many people get as much satisfaction in the process of building up their perfect bike by considered selection of frame, wheels and components as they do riding the finished article.
SRAM made claims to have produced the first sub 2kg groupset in their 2008 Red offering. However anyone who had taken the time to add up the component weights would have found that Campagnolo Record 10sp was under 2kg in 2007.
In 2011 SRAM Red still have the lightest group available (by 26g) with their BB30 crank option, however the BB30 cranks are not compatible with many bikes as yet. The Campagnolo Super Record group at 1875g is the lightest group that can be fitted to any standard bike.
|Group Weight in g||1875||1974||2096||2168|
|Group Weight in lb||4.13||4.35||4.62||4.78|
a The Super Record group was weighed with the titanium crankset option.
b The Athena group was weighed with the carbon crankset and shift levers.
Dura Ace Di2
Dura Ace 7900
|Battery + Loom||137c||n/a||n/a||n/a|
|Group Weight in g||2375||2111||2441||2624|
|Group Weight in lb||5.23||4.65||5.38||5.78|
c The Di2 system requires a battery and electrical cables which cannot be cut shorter. Together the battery and cables weigh 217g for 'medium' length. Typically the weight of standard shift cables would be 80g so we have added 137g to the weight of the Di2 group to take into account this difference.
|GXP BB Cups||105||115||115||inc above|
|BB30 Group in g||1849||2013||2244||2308|
|BB30 Group in lb||4.07||4.43||4.94||5.08|
|GXP Group in g||1928||2107||n/a||n/a|
|GXP Group in lb||4.25||4.64||n/a||n/a|