Got me wondering where I can trim fat. I'm weighing in at 19.5kg/43lbs and running:
E13 carbon bars
E13 plus stem
E13 LG1 Enduro carbon wheels
E13 Grappler Enduro tyres
Ergon SM Enduro saddle
Hope Tech3 E4 brakes
The std TranzX dropper
Std shock
Lyrik Ultimates
Mainly XT groupo
E13 alloy cranks
I wouldn't bother just replacing parts for the sake of only saving weight. If something breaks or wears out then by all means find a lighter replacement,or if you have something better/lighter lying around not being used then fair enough,,but just spending a lot of cash on light parts to save grams is (imo) not worth it.
Having said that,the following would be obvious and cheapish places to start
- you can save a bit by swapping the seatpost, a 31.6 diameter post and a shim could save weight. Maybe 100g to be saved
-lighter cassettes are available,maybe 100g to be saved over an xt cassette.
- tyres could be lighter - but tyres are a very personal choice, could save a lot of weight here,but you will end up compromising on puncture protection.
-cranks, could save 100 ish g by using carbon cranks
The cassette would be the obvious choice from the above when yours wears out,but given cassettes are consumables,would you want a more expensive cassette?
Chasing low weights is an expensive game of diminishing returns.
I have a 9.5 turning up next week, I'm going to swap some parts over with some better stuff I have lying around,but I expect the weight will still come in around 19.5 to 20kg.
Will be standard 9.5 spec except for the following
-fox 38 factory fork and RRP mudguard - heavier than stock
-maxxis assegai exo + on front- heavier than stock
-maxxis dhr ii DD on the rear - heavier than stock
-raceface turbine r stem-lighter than stock
-raceface next r carbon bars -lighter than stock
-sram axs mech-about the same as stock
Will replace the (enormously heavy) cassette with a lighter one (xt or e13 probably)when it has worn out in a few months time
May replace the shock witha float x2 I have spare, if I don't like it, but this will be heavier than stock.
May replace the brakes with magura mt7,but will give the stock brakes a fair go first.
All this should make the bike perform better than stock,but prob no lighter,and will cost nothing because I have all these parts already. Will sell off some of the stock parts and get a bit of money back