Anyone out there bulding WW Trail bikes

[freepk]

@CGT, you can see specs in my previous post, only shock and fork was changed )

[prebsy]

freepk, that thing is sweet. Definitely keeping me inspired to push the stumpy weight down.

[OnTheRivet]

27.5lbs (12.47kg) with Power Meter and heavy frame.

[Bumbabambuee]

M size Rocky mountain Element. 10354g as pictured. Not a true weightweenie build, but turned out to be pretty light.
Could shave off some from brakes, dropper, saddle and bar/stem. Also could use a bit less sealant. Added it by hand and weighted afterwards.

[OnTheRivet]

M size Rocky mountain Element. 10354g as pictured. Not a true weightweenie build, but turned out to be pretty light.
Could shave off some from brakes, dropper, saddle and bar/stem. Also could use a bit less sealant. Added it by hand and weighted afterwards.

RM1.jpg

RM specs.PNG

Wouldn't this be a XC bike? 120mm travel with super light tires?

[Hexsense]

In the current trend, it'd be called downcountry bike. Basically, something in between trail and traditional XC.
Normally:
They have 120mm travel fork and 100-120mm rear. The amount of travel is almost trail level. But way worse damper to save weight. Sid Ultimate 120mm fork and SIdluxe shock perfectly fit that description. Fox DPS is borderline in this category too.
Tire: 2.4" tire with real tread pattern is beefier and slower than traditional XC. Example of XC racing tire for me is Continental Race King 2.2" at 595g. On Wolfpack camp, it'd be Wolfpack MTB Speed 2.25" at 608g.
Dropper: XC usually have either no dropper post or a short travel one (65mm, 80mm or 100mm). 150mm travel dropper is straight up trail bike.
Remote Lockout: XC involve stand up sprinting from the start line and maybe also at the finish line. A bike without remote lockout (or auto lockout like Specialized Brain) isn't a dedicated XC bike.
Brake: MT trail have 4 piston front caliper. Again, that's trail/downcountry setup. Real XC would stick with lighter 2 pistons using 160mm rotor.
Stem: BikeYoke bar keeper only offered in 35,45,55 mm length. Traditional XC setup still use longer stem than that.

M size Rocky mountain Element. 10354g as pictured. Not a true weightweenie build, but turned out to be pretty light.
Could shave off some from brakes, dropper, saddle and bar/stem. Also could use a bit less sealant. Added it by hand and weighted afterwards.

If it'd be my trail riding bike, I'd make two changes:
1) Manitou R7 Pro fork instead of Sid Ultimate. Gain 120g but get real good damper instead of that dinky one in Sid Ultimate.
2) Manitou Mara Inline shock instead of Fox DPS. Gain 70g for better damper than Fox DPS.

If it's mostly used as XC bike then screw these changes. Light weight over comfort or traction for racing.

[Hexsense]

- duplicated.

[LeDuke]

Huh? Plenty of “real” WC XCO bikes out there running 120 SID Ultimates which require a 180mm rotor.


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[Hexsense]

For that point, yeah. 180mm front rotor as required by the fork, so 180mm front and 160mm rear. Riders on many team still use Sid Ultimate SL at 100mm travel in XCO/XCM. I think only Scott bike abandon 100mm fork entirely.
His bike has 180mm front and rear though.

Still, Sid Ultimate sided closer to XC than trail in the downcountry spectrum. It has dinky damper. It support hard lockout by remote. That's straight up XC. But the amount of travel and fork stiffness creep into downcountry territory.
Without remote lockout or auto lockout, it's still not really a dedicated XC fork.

[Bumbabambuee]

It's indeed a downcountry bike built with a spec that I could go for XCM races from time to time.

I wouldn't call it XC bike at least. The frame itself offers very capable platform for descending given how much travel it has. 65 degree head tube angle, fairly long reach, progressive suspension. You can't use smaller than 180mm rotors on the frame.

I truely believe it will be close to perfect bike for all kinds of trails you can find in Finland. Except bike parks of course.

The frame is designed for 130mm fork, but I wanted to give the Sid ultimate a go by using 10mm headset extender. Might change it in future if I feel the SID doesn't offer good enough performance. Same goes for wolfpack tires. According to their site and some reviews the combo I have now is kind of a do it all type of setup. Let's see. Had DHF/Aggressor in my previous bike so for sure there's a step down in grip.

[prebsy]

A couple upgrades coming for my stumpy: a 34 factory with fit4 and bontrager XR4 team issue tires. Should almost 500g on tires and almost 500g on the fork.

[prebsy]

I believe this is the lightest 34 configuration possible. 34 140 with fit4 and kabolt.

7 3/8", star nut, crown race, cable guide

1739g


Full build now down to 12.6kg


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[freepk]

Yalta, Ay Petri, Kizil Kaya trail, Last Tarvo 12.3kg )))

[farsportssandy]

I have my bike with a lightweight MTB XC wheels, 36mm external wide.@ www.wheelsfar.com

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[alexdi]

I'm in the process of building a '20 Trance Advanced Pro 2 (130/115ish) into a light trail bike. The frame isn't light (~2800g with shock), but it's a proper suspension that's so much more plush than any XC bike I've ridden. The fork is a Rhythm 130 (~1850g). Works fine. I'm not motivated to change it because the alternatives aren't that much lighter relative to cost, especially if I opt for a good (read: GRIP) damper. Also refuse to compromise on the dropper; they're all heavy in the 180+ travel range and I don't care.

It'll be in the 25ish range when I finish.

Some parts:

EIE i35 carbon wheels - 1510g
XX1 DUB crankset - 425g
XX1 11 cassette - 265g
XX1 11 derailleur - 240g
XX1 11 shifter - 110g
Maxxis Ikon 2.6 tires - 750g x 2
Nukeproof 800mm +38 bar - 265g
AliExpress carbon saddle - 155g
60mm +25D stem - 130g
Magura Storm 180/160 rotors - 220g
Magura MTS brakes - 485g
Ritchey WCS pedals - 225g
ESI Extra Chunky grips - 80g
GUB 1158 saddle - 155g
OneUp 210mm 30.9 dropper - 575g

The bike came with Guide 4-piston brakes. Better modulation than the MT4, but power feels the same. Pads have a huge effect on initial bite.

I think XX1/11, combined with the crazy light XX1 DUB crank, is one of the best drivetrains available. The 42T big sprocket is easy enough with a 30T ring. If I'm spinning out on a 10T/30 on 2.6 tires, I'm probably on asphalt.

EDIT: Some tweaks to the parts list. Higher bar, better rotors, longer dropper, wider wheels, but Ikon (for the moment) tires. Weight with pedals and sealant is 25.6.