Suggestions for weight reduction for MTB hardtail

Discuss light weight issues concerning mountain bikes & parts.

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apctjb
Posts: 59
Joined: Mon Oct 30, 2017 11:27 pm

by apctjb

Just finished my first attempt at a lighter weight MTB.

Came in under budget but over weight. (~10kg). Frame is light enough (~1200g) but front shock (120mm Reba) , dropper (125mm KSlev), large cassette (11-42), larger tires, wheels (2.6" on 40mm rims) all add up. I could have shaved 400g going with SRAM XX eagle instead of XT groupset but I like XT and the price was less than half of SRAM. 27.5 wheels are about 1600g with 40mm wide rims for running larger tires.

On my next build I would like to get under 9KG, but how? What would you suggest?
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silvalis
Posts: 375
Joined: Mon Sep 07, 2015 1:02 am
Location: Aus

by silvalis

narrower rims and narrower/lighter tyres (or have you already gone for 2.6 instead of 2.8?). Then a shorter 100mm dropper. Then less fork travel (the reba 120mm is what? 1.57kg? - pretty light).

I can't tell which bontrager tyre you are running, but a 2.6WT Rekon 3C maxx terra is 730g.

I'm of the opinion that 40mm inner width is too wide for a 2.6" tyre, but it probably depends on the model of tyre/profile. 40mm rims are for 2.8-3" plus tyres.

apctjb
Posts: 59
Joined: Mon Oct 30, 2017 11:27 pm

by apctjb

Thanks for the suggestions.

I got the 40mm rim in case I wanted to run 2.8", the frame can take up to 3". For the next build going to limit it to 2.6 so thinking 35mm rims and non-boost wheels.

The Reba came in around 1600g with axle. Not sure how much lighter a Reba with 100mm will be however, I thought they used pretty much the same parts.

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silvalis
Posts: 375
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Location: Aus

by silvalis

Yeah I was thinking that a 100mm reba wouldn't be any lighter afterwards. They normally just limit travel internally don't they?

I might have come to the same conclusion with you around tyres. 2.8 not worth it.

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rainerhq
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Location: Estonia

by rainerhq

apctjb wrote:
Thu Feb 15, 2018 1:50 am
Frame is light enough (~1200g)On my next build I would like to get under 9KG, but how? What would you suggest?
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marcocolo99
Posts: 5
Joined: Sun Feb 18, 2018 3:50 pm

by marcocolo99

I think you could easily find lighter, reliable bars, stem and grips that don't break the bank. Extralite grips, Wren stem, Easton EC90 bar maybe?

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