Is 6.5kg too light

Discuss light weight issues concerning mountain bikes & parts.

Moderator: Moderator Team

konky
Posts: 839
Joined: Mon Dec 14, 2009 6:26 pm

by konky

This post has been running prominently for over 3 weeks and not one person has indicated that they own a bike in the 6.5kg range and posted pictures of their lightweight steed. skyfire1202 is mentioned but he is no longer a member. Do they, owners/bikes, exist? This is weight weenies. In the road section loads of members claim to have 5kg road bikes.

It would be hard to build a first hand 6.5kg MTB for less than 10GBP/14USD/12EUR. As MTB bikes tend to take a hammering do people not bother for fear of seeing their 10GBP investment being wrapped around a tree. I ride my 5KG road bike hard but I'm very careful not to crash. I don't take risks on it.

Is that the reason why there does not appear to be any very light MTBs out there, or is there another reason, or are there just lots of shy or disinterested members out there?

User avatar
LeDuke
Posts: 1144
Joined: Sun Oct 07, 2012 2:39 am
Location: Front Range, CO

by LeDuke

That's the difference. The bike I race is also the bike I train on. Swap out the tubulars for clinchers and that's it.

And, as they say, "rubbin' is racin' ". If you aren't crashing occasionally, you're either an amazing bike handler or not pushing hard enough.

Now, if you're just walking this bike over every rock or root you see, taking it to the grocery store or hanging out in front of coffee shops, sure, make it as light as you want.

skyfire1202
Posts: 214
Joined: Wed Apr 16, 2008 7:43 am
Location: Sapporo City, Hokkaido, Japan
Contact:

by skyfire1202

Who's no longer a member? That is just one of my bikes. I built the bike for a hill climb race that we have here twice in a year. The 911-gram wheels are with sub220-gr Innolite rims, Tune Dezibel and Princess Skyline hubs laced with Superspokes and I have tested them on 1 foot jumps with no pronblems. It's with Eclipse tubes, but can be lighter with tubeless setup. I could change the wheels to Race Kings 2.2 and it would still be below 6Kg and it's plenty strong for my weight. I do have a DT XRC fork also custom painted for that bike just in case I need a front suspension, but I have a separate Scale RC hardtail setup with XX1 on Clavicula cranks too and sub 900-gram Extralite Tubotreme wheels mounted with XC2 Plus that is also sub 6.5Kg. For rougher races, I use my custom sub 7.1-Kg Spark 10 on XX1 setup with the same setup as the RC but with AX tubular rims and the rear spokes are CX-rays.

konky
Posts: 839
Joined: Mon Dec 14, 2009 6:26 pm

by konky

Sorry skyfire1202 but I looked you up under 'members' and couldn't find you.

LeDuke what you say makes sense and actually confirms my reasoning. Having said that if your pockets are deep enough I'm convinced, as skyfire1202 indicates, it is possible to build a 'strong as you like' trail 29er MTB under 7kg. A bike you could race all day long. To get to 6.5kg you will have to compromise on wheels and fork I would think.

Is skyfire1202 the only WW hero out there.

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

by jooo

Most are just not very active on here any more. There are/were plenty of members with cool rides, close to the weight you're talking about eg:
Image
6.6kg

Image
6.8kg

Most of the MTB weight weenies seem to hang out on the German and Italian forums these days.

skyfire1202
Posts: 214
Joined: Wed Apr 16, 2008 7:43 am
Location: Sapporo City, Hokkaido, Japan
Contact:

by skyfire1202

Nice! Is that 6.6 without pedals? I bet he could have gotten away with non setback seatpost, 2x crankset, less sticker logos, and no valve caps to save a few more grams.

Konky, no worries. No harm done. But yeah, weightweenies is not that way it used to be. It's less interesting now, so we don't post much of our rides lately.

konky
Posts: 839
Joined: Mon Dec 14, 2009 6:26 pm

by konky

It seems WW is for road users now, and only a bit for MTB. Things have changed in amateur cycling a lot over the last 10 years or so. Road cycling has eclipsed off road by a huge amount. I suppose the state of the MTB forum is just a reflection of that. You could blame Dave Brailsford.

krzysiekmz
Posts: 1082
Joined: Sat Nov 10, 2007 4:23 am
Location: Poland/Toronto
Contact:

by krzysiekmz

No, we're still here and alive. Road has their own sub-forum. Build that 6.5 kg MTB bike and ride it, then post it here.

Another thing is the hate that comes from members who have never seen <1000g wheel set never mind owned one and so on.

Some frames, wheels and forks were not stiff enough in 26'' size for bigger riders, yet they are perfect in 29'' format, regardless of some "improvements''

Chris.
Orbea Oiz - xxxx
MSC Koncept Carbon Di2 - 6955g
Leichtkraft Team Carbon - 6868g.

bigben99
Posts: 39
Joined: Mon Sep 30, 2013 8:42 am
Location: Europe

by bigben99

Nice and Light :up:


jooo wrote:I think skyfire1202 is still a member here. His bike 12.32lbs / 5.58kg

Image

Sure, some people wouldn't think Maxlites etc are daily riders but skyfire1202 still races his bikes. It's not like it would be heavy with with a SID, Crest wheelset, Racing Ralphs and Ashima rotors anyway.

DanW
Posts: 1037
Joined: Fri May 02, 2008 5:39 pm
Location: Here, there and everywhere

by DanW

6.5kg is not too light....

I'm planning on building a super light MTB but will I be wasting my money and ending up with something that has more disadvantages than advantages?


... but putting together a super light MTB that is robust enough to ride any any half decent rails is certainly a challenge and not done on a small budget. I work on the basis of "don't race what you can't replace" so if you are able to fold several thousand pounds worth of MTB exotica in a crash without crying then go for it :D

Plus you have said you plan to ride the MTB once a week so is the high cost justified? Only you can say. WW for me is all about the mentality and approach when building up a bike to suit your needs and each person will be restricted in some way by other factors such as durability/ value/ whatever. The WW mentality within your own constraints is more the WW spirit than absolute weight IMO so it isn't fair to say WW MTB is dead now...

As others have said, your best bet is to post up the parts you consider suitable for your build and others will be able to suggest alternatives one way or another.

njee20
Posts: 572
Joined: Thu Jan 12, 2006 5:58 pm
Location: Surrey, UK

by njee20

If you're new to mountain biking then you'll find a bike of that weight harder to ride than something a bit heavier. The Surrey Hills aren't particularly technical, but you'll find yourself being bounced around all over the place on a bike of that ilk. It's not an inherent problem, but I'd suggest most people will go faster if you sacrifice weight for strength and stiffness in a few places.

I'm a surrey hills local, gladly show you around when you've built it!

Basically it depends if you want a bike to hang on scales, or one to ride.

User avatar
cerro
Posts: 1385
Joined: Fri May 12, 2006 2:11 pm
Location: Stockholm, Sweden
Contact:

by cerro

krzysiekmz wrote:Another thing is the hate that comes from members who have never seen <1000g wheel set never mind owned one and so on.

Some frames, wheels and forks were not stiff enough in 26'' size for bigger riders, yet they are perfect in 29'' format, regardless of some "improvements''

Chris.


Would love to own a <1000g wheelset. Had a wheelset for my Scalpel last year at 1002g, was stiff and good. The thing with light parts is that they need more care and most people only have one bike which makes i a bit harder. If you got two or more bikes it's easier to just save every gram you dare on one bike and keep it top notch.

Impressed by the Scalpel posted here earlier at 6,8kg.
/jonas l
http://cerrol.wordpress.com (my cyclingblog)

konky
Posts: 839
Joined: Mon Dec 14, 2009 6:26 pm

by konky

njee20

Thanks for the offer. Might take you up when I'm up and running.

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

by jooo

cerro wrote:Impressed by the Scalpel posted here earlier at 6,8kg.

For sure. The crazy thing about that bike is that it's already so light, but there are a few places to save weight, albeit not cheaply, but easily none the less and without cost in performance. Innolite rims or something similar, 1 piece carbon bar/stem/steerer combo, saddle combo, lighter crank/ring setup with maybe a single front chainring... etc

njee20
Posts: 572
Joined: Thu Jan 12, 2006 5:58 pm
Location: Surrey, UK

by njee20

It seems WW is for road users now, and only a bit for MTB. Things have changed in amateur cycling a lot over the last 10 years or so. Road cycling has eclipsed off road by a huge amount. I suppose the state of the MTB forum is just a reflection of that. You could blame Dave Brailsford.


I think you miss the point too - mountain biking has evolved to a point where folk don't care about weight as much. Most people ride mountain bikes for the descents, where the best kit is rarely the absolute lightest. Look at the advances in mountain bikes: hydraulic brakes, suspension, 29ers, latterly things like dropper seatposts. All add weight, but for most they enhance the enjoyment.

Race courses are becoming more demanding at the same time, a rigid v-brake equipped bike may be the lightest, but it won't be the fastest.

There are some very active mountain bike forums - BikeRadar and Singletrackworld notably, but ultra lightweight kit really isn't of interest to the majority.

Post Reply
  • Similar Topics
    Replies
    Views
    Last post