please help to save some weight on my 27.5 focus raven 2015.

Discuss light weight issues concerning mountain bikes & parts.

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long19000
Posts: 20
Joined: Thu Feb 25, 2016 2:45 pm

by long19000

The spec is below:
Saddle: Fizik thundra 2 mg 230g
Cex stem w/ ti bolts 80mm 118g
Cex seatpost 31.8*400mm 304g
Cex handlebar 31.8*720mm 284g
Magura mt4 w/180mm, 160mm, bolts, adapter 785g
Fox 32 factory FIT 4 15qr 27.5 100mm 1700g
DT Swiss XR1501 27.5 1470g
XTR M9000 cassette 11-40t 328g
XTR M9000 Shifters (F,R) 224g
XTR M9000 Chain 250g
XTR M9000 F, R derailleur 370g
Rotor rex2.2 w/38t,28t bb30 615g
Xpedo Spry pedals 250g
Continental X King Racesport 27.5 2.2
1050g
Tubes 1.9/2.2 27.5 466g
Focus Raven 27r 17’ 1300g
Rotor BB30 Steel + 2*11.5mm spacers 80g
Hand grips 86g
DT RWS Steel 50g
FSA Headset c40 + topcap + starnut+ carbon spacer 15mm 122g
Cable hose+ Cable 70g
Chain guard. 50g
Seatpost clamp 21g
Total 10177g
My goal is to get under 20lbs. Any suggestion?
my current budget is about usd1300
Thanks!

by Weenie


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LeDuke
Posts: 2021
Joined: Sun Oct 07, 2012 2:39 am
Location: Front Range, CO

by LeDuke

Tubeless (performance more so than weight, but some to be had there), bars, seatpost. 466g for two tubes is impressively heavy. Some Stan's/Orange Seal, plus a layer of 3M 8898 or Gorilla tape, will help you lose most of a pound while improving the overall handling of your bike.

Also, I'd check eBay for a lighter, albeit used, version of that saddle, if you like it.

Wheels are reasonably light, but there are lighter at decent prices.

Exar
Posts: 352
Joined: Wed Mar 01, 2006 10:28 pm
Location: The Netherlands
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by Exar

Seatpost and handlebar are crazy heavy, you can easily save weight there.
Chains to the right!

long19000
Posts: 20
Joined: Thu Feb 25, 2016 2:45 pm

by long19000

I wonder if the x king racesport is tubeless ready,
I look that up on their website and they state that only the "protection" version of x king is tubeless ready
Thanks for opinions!
Actually the fox fork shocked me a bit as the listed weight is 1600/ 3.53lbs.
I weight that myself after cutting steering tube to 195mm and it weights 1700g!!

TheRookie
Posts: 926
Joined: Wed Jan 18, 2012 4:23 pm
Location: Midlands, United Kingdom

by TheRookie

Seatpost is at least 145g over any semi decent part weight, bars are over double a decent carbon parts weight. (I have a Chinese carbon seatpost 163g and bars 122g).

466g is very heavy for tubes, shop around and you can get them at circa 100g each - or just go tubeless, any folding tyre will go up tubeless, they don't have to be the silly 'tubeless ready' ones.

A breakdown of the brakes weight would help a lot, discs are a often nice easy saving.

An easy 30g can be lost out the saddle, something like a Bonty inform RXL.

Not sure of the breakdown but the headset all in looks heavy.

Fork is shocking when my 5 year old SIDS are 1435g with the starnut! (admittedly no through axle).

1x conversion will see you knock off circa 350g

Foam grips are an easy 50g saving for pennies.

If its a fixed seatpost clamp, it's heavy, if its QR that's pretty good.
Impoverished weight weenie wanna-be!
Budget 26" HT build viewtopic.php?f=10&t=110956

CGT
Posts: 342
Joined: Fri Jan 05, 2007 5:33 pm
Location: Stockholm, Sweden

by CGT

Wow, there is plenty of parts so save weight on. If you get yourself Schwalbe's new Evo Tubes, you would save 300 grams alone on the tubes!

And besides those, as others have already mentioned, your handlebar and seatpost are real boat anchors. You have another 250 grams there to save if you go for a nice carbon bar and seatpost (doesn't even have to be crazy exotic ones).

Those three alone would get you half way there.

long19000
Posts: 20
Joined: Thu Feb 25, 2016 2:45 pm

by long19000

Thanks, any suggestions on 31.6*400 seapost and 720 5mm low riser handlebar?
Current plan:
1. Keep using X king race sport, buy tubeless valves and add 2 oz notubes sealent to each tyres.
2. Change to 1*11, using absolute black CX Narrow-wide 110 38t (keep the rex2.2 crank)
3. Use Ritchey WCS ergo grips
4. Use 3M tape instead of rubber chain guard

BTW, the disc is 116 g and 96 g. Any idea on a light weight disc brake? Formula R1 racing?
Thanks!

jooo
Posts: 1510
Joined: Wed Feb 02, 2011 3:48 am

by jooo

Uno stem is about as light as you can get without spending big $$$.

Image

That is a 70mm with Ti bolts, an 80mm should be circa 90 grams.

TheRookie
Posts: 926
Joined: Wed Jan 18, 2012 4:23 pm
Location: Midlands, United Kingdom

by TheRookie

My 70mm Uno stem and Ti bolts is a little heavier at 88g.

Discs, Ashima, Alligator or if you want a full braking surface A2Z, easy 50g saving. (I use an Alligator rear and A2Z front in 160mm).
Impoverished weight weenie wanna-be!
Budget 26" HT build viewtopic.php?f=10&t=110956

Everyone
Posts: 56
Joined: Thu Jun 04, 2015 11:02 am

by Everyone

You could swap to one of the SRAM 11s cassettes providing you can get an XD freehub for your hub. The new XTR are disappointingly heavy.

AdyM
Posts: 127
Joined: Sat Jan 18, 2014 4:12 am

by AdyM

[quote]2. Change to 1*11, using absolute black CX Narrow-wide 110 38t (keep the rex2.2 crank)/quote]

Depending on your riding, but a 38T is pretty stiff gearing. Would also thoroughly recommend oval chainrings too!

For the seatpost and bars, I would recommend an Alu post, like a KCNC or Aerozine ones, better weight saving for the money. The bars, definitely go carbon as the vibration damping is far nicer. I use Ritchey Carbon 720mm and really like them, picked them up cheap on bike-discount.de. Personally wouldn't go for chinese carbon, but I know people have had good success YMMV.

long19000
Posts: 20
Joined: Thu Feb 25, 2016 2:45 pm

by long19000

I personally like the round chainring.
Having some digging and here are the 110 bcd 38 t I've found. Which one do you think the best? Thanks!

Race Face Cyclocross -?g
SRAM Force CX1 X-Sync -68g
Blackspire Snaggletooth CX -?g
Wolf Tooth Cyclocross -66g
Absolute Black Cyclocross -59g
Hope Retainer -61g
Garbaruk CX Melon -54g

jooo
Posts: 1510
Joined: Wed Feb 02, 2011 3:48 am

by jooo

This is an option for smaller 1x rings on your existing crank: https://www.opencycle.com/blogs/article/rotor-crank-conversion-from-double-to-single-chainring

by Weenie


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