K2 / Proflex Riders Group
General => Tech Forum => Topic started by: 4500_rider on May 02, 2007, 10:28:00 pm
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Hi everyone,
Recently got rid of my '06 scott genius mc20 frame... was going to build it up but decided to go for a rigid frame instead.
Have looked at the scott scale 10 & 20 and the giant xtc composite... beyond that not much is grabbing me so... what would you get?
Its got to be rigid, it's got to be lightweight.
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Go Ti.... You won't regret it.
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are you looking for new or old? If you are going retro, check out www.retrobike.co.uk - they''ll have loads of ideas for you! Steel, Ti, Ally, Carbon, etc...
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Looking for new... or close to it... max 2yrs old, preferably a composite/titanium frame as i'm wanting to make it as light as possible.
Anyone know anything about Sintesi.. they seem to make mtb frames... thought they were purely road?
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have you looked at a kuota kup ht? nice piece of carbon that one, the merida carbon frame is also well liked by the journo`s also how about a van nicholas ti frame from the former airborne people.
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What about this combinatio:
http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&rd=1&item=330113079873&ssPageName=STRK:MEWA:IT&ih=014
and
http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&rd=1&item=330113087585&ssPageName=STRK:MEWA:IT&ih=014
I believe they are light enough. If you go to the Omega page you see they know about the Titanium stuff...
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why you donīt see in this page? www.proflex-usa.com, there are some rigid bikes of the new generation of Proflex.
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look at this page
www.proflex-usa.com
and you will see the new rigid frames of proflex
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Cheers for all the suggestions!
Quite like the Kuota Kup HT... and the new proflex 497 also looks good, but i'm in the UK so getting one may be tricky.
Found a barely used scott scale 10 on ebay usa... frame weight is 966g or 2.13lbs in old money... that seems to be the lightest one can get, going to bid on it and see if i get it.
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Just an update - went for a scott scale 20.
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Now that you've got the lightweight frame, you can afford to go a little bigger on your tires. That's my single best recommendation for a hardtail... A stiff aluminum frame with big tires will ride smoother than a flexy ti frame with small ones...
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Matno..... cheers for the advice on going for a bigger tire... I did have 2.3's in mind... dont think i'll go bigger.... and dont think i'll go less than 2.1's... but at the moment nearly everything is an option... all I have is the frame and I am completely undecided on what components i want...
except for the drivetrain... thought of going with SRAM but shimano will be lighter and SRAM dont, as far as I can see, make an e-type front mech.... ?
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Matno..... cheers for the advice on going for a bigger tire... I did have 2.3's in mind... dont think i'll go bigger.... and dont think i'll go less than 2.1's... but at the moment nearly everything is an option... all I have is the frame and I am completely undecided on what components i want...
except for the drivetrain... thought of going with SRAM but shimano will be lighter and SRAM dont, as far as I can see, make an e-type front mech.... ?
Here is a nice scott build to look at.
http://weightweenies.starbike.com/articles.php?ID=27
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That end weight is impressive for a full susser!
At the moment and on paper my hardtail scale 20 is weighing in at 20.003lbs.... nearly 2lbs under the stock weight:
Scott Scale 20, size M, incl headset - 1104g
Easton EC90 CNT XC Handlebar - 99g
Extralite Ultrastem UL2 - 96g
Extralite Neogrips - 40g incl bar plugs
Avid Juicy Carbon discs - 790g for the pair
Shimano XTR M970 shifter pods - 215g for the pair
Shimano XTR M970 Hollowtech II cranks & BB - 770g
Shimano XTR M971 Rear Mech - 197g
Shimano XTR M970 E-Type front mech - 142g
Extralite Hollowgold 9 chain - 258g for 116 links, will use less
Shimano XTR M970 titanium 11-32 cassette - 224g
Crank Brothers Egg Beater Twin Ti - 218g pair
Continental Speed King Supersonic 2.3's - 500g each
Tubes - 190g estimate
FSA XC300 Wheelset - 1700g
Pace RC39XC fork, 100mm - 1420g
FSA K-force Light Carbon seatpost - 175g
Scott Seat clamp - 18g
Selle Italia SLR seat - 135g
Total 9.073kg / 20.003lbs - plus a couple of pace frame protectors @ 4g each
Why the XC300's I hear you ask... they are heavy i know, but, going for a really good deal and they will work as a bench mark
I know I can save weight changing the wheelset, using tubeless tyres and going for a thinner tyre.
I can save a few grams with the rear mech by changing the stock pulleys to carbon ones.... the pulleys simply guide the chain and no stress is put on them when peddaling so should be ok... or am i wrong?
I considered brake/shifter combo's but prefer they be kept seperate.
I can "shave" the discs.... and use ti bolts instead of the stock ones that come with the carious parts.
It would, and still is possible, to save weight in the crankset/BB department but...the scale 20 has a 73mm BB shell... i'm finding that not a lot of cranksets work particulary well with this and an e-type mech. I can save weight here but it means shelling out 2-3x what the hollowtechs will cost.... I was thinking a Clavicula.... but at nearly Ģ640 for them.... no.... build is already going to cost a fortune.
Any other weight saving tips? Agree with my choice of parts, specifically the choice of disc brakes? What changes would you make?
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Well, you can steal some ideas from this Scott Strike that was in ebay some time ago:
http://cgi.ebay.com/scott-strike-carbon-18lb-superlight-XC-racing-mtb_W0QQitemZ280108077015QQihZ018QQcategoryZ33503QQrdZ1QQcmdZViewItem
18.96 lbs total weight
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I did see that listing on ebay...really nice bike.... funds allowing i'm going to follow in some of his footsteps.
Looking at his spec though... I dont understand two of his choices - the 12-27 cassette & the X10SL chain - both of these are for road use!
If he wanted a low ratio casette why not go for the 11-28t casette from SRAM... true its for 8spds but.... do you really 9spd?
As for the chain... the X9SL is for xc use and is the exact same weight!
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mmmm where do i start? i know the forks, have you thought about the look fournales vtt fork? lighter than the rc39 and probably cheaper but with only 80mm travel, or theres always the manitou r7 thats also lighter than the rc39 and cheaper. on the tyre front how about a panaracer razor xc2.1? lighter than a speed king supersonic and probably as wide as ive always found continental tyres to come a little narrower than they are supposed to be (im using tioga red pheonix 1.8`s on my hardtail and dont have any comfort issues with them and havent punctured in 10 months use and they only weigh 364grammes) i can understand why some people use the 9 speed dura ace cassette instead of the 12-32 xtr one, its lighter, cheaper and if your bike weighs next to nothing then your not going to need a 32 tooth bail out cog plus you can also use a medium cage rear mech. have you thought about using sram esp 9sl gripshifts at only 160 grammes per which is lighter than the x-0 twisters that liam killeen uses.(ive got a pair to sell too) instead of shaving your discs why not try stans aluminium rotors theyre very light but im not sure about longevity or is this a race only build? lastly, if you get an slr saddle get the xp version as the extra padding is worth the 40 or so grammes it adds. good luck with the build and dont forget to post the pics when you get it finished!
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Jeff... cheers for that and yes... this bike is a race build.
The manitou looks like a good option - comes with lockout, weight is slightly under the rc39 and its nearly half the price of the pace! I did think about using the fournales but... it doesnt come with lockout.
SRAM...*sighs*.... if only they made an e-type mech! Otherwise i'd have used them.... I know you can "blend" sram & shimano but i just dont like doing it... cant offer a valid reason... it just seems wrong...
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if its a race build id definately go for the tiogas rather than a speedking, the tiogas are incredibly fast and lightweight and grippy do you really need comfort in a race?! im not sure how long the stans alloy rotors last but they are the lightest that are available i think! with these options you could save best part of 500grms
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SRAM...*sighs*.... if only they made an e-type mech! Otherwise i'd have used them.... I know you can "blend" sram & shimano but i just dont like doing it... cant offer a valid reason... it just seems wrong...
nowt wrong with adding a bit to a decent sram build