Wheel weights.

I have a rockhopper 05, the wheels that originally came with it didn't last long. I now have a pair that my brother had lying around. They have Sun Blackeye rims the rear hub is a Shimano Disc FH-M475 and the front an unbranded from kona. The spokes are standard stainless steel.
I have Nutrak Butyl Lightweight tubes off chain reaction and Conti Vertical 2.3 tyres Protection version).
I am just wondering how much weight i could save by spending around 120 quid on new wheels. And in time maybe buy lighter tyres? Would i be able to get a significant performance increase?
I really don't want to sacrifice too much strength to save weight, only the bike is starting to feel a bit sluggish in terms of acceleration.
Thanks Guys.
I have Nutrak Butyl Lightweight tubes off chain reaction and Conti Vertical 2.3 tyres Protection version).
I am just wondering how much weight i could save by spending around 120 quid on new wheels. And in time maybe buy lighter tyres? Would i be able to get a significant performance increase?
I really don't want to sacrifice too much strength to save weight, only the bike is starting to feel a bit sluggish in terms of acceleration.
Thanks Guys.
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VOODOO CANZO
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Also are Mavic 717's tough or would 719's be a better option?
The budget was is not designed to include tyres as i have some maxxis ignitors in 1.95 witha kevlar bead which are lighter than the conti's.
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VOODOO CANZO
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Take a look at this months WMB mag,for itests and weights on hubs and rims.
Your tyres would be heavy,but depending on whereyou ride,you might find the extra protection useful.
However have you considered lighter tyres and running them tubeless?
I reckon you could save 100g per tyre easily by a tyre swap,and a further 100g per wheel if you ran them tubeless? Plus you would get all the other benefits of running tubeless such as better ride,traction and virtually no punctures.
If you want something faster rolling,Conti Spped kings are lighter still,especially if you go for the supersonic version,which is 400g per tyre.
Take a look on www.merlincycles.co.uk for excellent wheel deals.
2010 Giant Defy Advanced
2016 Boardman Pro 29er
2016 Pinnacle Lithium 4
2017 Canondale Supersix Evo
Mavic 717 Disc 400g
Mavic 719 Disc 460g
(or either of the above in v-brake i run discs thought)
Or maybe DT 5.1's for a little more strength 500g
719 for harder riding
5.1 as the 719
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I think i might be a bit rough for the 717.