RoadBikeReview.com's Forum Archives - Cyclo-Cross


Archive Home >> Cyclo-Cross(1 2 3 )


Would you put top mount levers on a carbon bar?...(13 posts)

Would you put top mount levers on a carbon bar?...TFerguson
Jan 8, 2004 11:32 AM
I'm using a pair of Frog Legs on my current Al bar but I have a wider EC-90 I would like to try. What do you think?

TF
re: Would you put top mount levers on a carbon bar?...laffeaux
Jan 8, 2004 12:05 PM
I can't imagine that top mounts would stress the bar to any great amount. I think it would work.

EC90s do not permit aero bars, but those bars support a relatively high weight at the ned of a relatively long lever arm. The amount of force generated by squeezing top mount levers must be less than a full sprint with your hands in the drops. (at least I'd gess that)

It would probably be worth putting a thin piece of tape beneath the mounts, much like the tape that comes on the bars where the stem mounts.
No....mosovich
Jan 8, 2004 3:20 PM
I've seen two carbon bars break so far and both were Easton. I wouldn't.
Carbonatpjunkie
Jan 8, 2004 3:48 PM
Personally I wouldn't use carbon bars for cx. A) because I'm a Clydesdale. B) Carbon is designed to 'damp' vibration not provide suspension. The rigors of cx both from rider and terrain would push CF bars beyond what they are designed for. C) Handlebars is one of the last things I'd want to break. Personally I think Carbon is getting over utilized. It saves some weight over other materials but it's ride 'softening' capabilities are being misinterpreted and misused. CF functions best on higher frequency vibration (typical road chatter) not the hrasher 'hit's of offroad riding. If you are a weight weenie with disposable income great.
Just hope you see the crack before it breaks.
Following your argument, esplain somthing to me thenpitt83
Jan 8, 2004 5:31 PM
Why on earth would you need a CF bar on a mountain bike with a suspension fork?

If anyone can logically reason this out of my wallet, I'll buy THEM a CF bar for the trouble.

I agree with you ATP, it's not the big hits they dampen, but just how much "road buzz" are you getting on a FS MTB?

Dave
I would think they'd be alright, since they sell mtb carbon barsjtferraro
Jan 8, 2004 9:25 PM
and mtb carbon bars obviously have brake levers attached to them. I actually have the Easton EC70 carbon bar on my aluminum mtb and it only has 50 or 60mm of travel so I decided to give the EC70's a try. So far I haven't used them much for mountain biking b/c I purchased them late in the season. I've done one cx race w/them and used them on the road (w/slicks). I definitely noticed less "buzz" being tranmitted to my hands while riding on the road.

We'll see how they hold up next season...

-Jeff
agreedatpjunkie
Jan 8, 2004 10:43 PM
I think it's purely for weight. maybe for long fire road descents you'd get a slight muting of chatter that the fork may not cover. The one I find weird is the CF set up on the Pinarello Prince. Now I understand having it on the seat stays to reduce the rear wheel vib. up to your backside but they counter it with chain stays that are tall and thin. Tall and thin equals vertical stiffness and lateral flex so the chain stays work against the seat stays. John Castelano at Ibis had it right with the SilkTi. Wide and flat, which produced double what other St's could do and with a stiffer rear end torsionally. Now I'm only an armchair engineer but this just makes sense. I sometimes get in arguements with people who somehow miss basic rules of science.
it's all weightlaffeaux
Jan 9, 2004 12:03 AM
I have a Easton carbon bar on one MTB and an Easton AL bar on the other. I can tell absolutely no difference in the bars - although Easton claims that the carbon bar is stronger. The only difference is weight.

I've beat the crap out of the carbon bars for 2 years and they still work great - bar ends and all.
re: Would you put top mount levers on a carbon bar?...dlbcx
Jan 9, 2004 8:58 AM
I have only seen a couple of guys using carbon bars with top mounts (Jackson and Andy on Clifbar, I believe). They didn't have any problems with the levers but someone told me that Clifbar had some problems keeping the bars from slipping in the stem.
If you are going to use the top mounts, make sure that the clamps on the top mounts are free of any burrs and don't overtorque the bolts. You might have to check the website to find out what the torque values are.
I have feeling that the mtn bars and road bars are laid up differently since Easton would probably design the mtn bars for the higher impacts and may be using a different version of carbon fiber, versus the road bars.
re: Would you put top mount levers on a carbon bar?...MShaw
Jan 12, 2004 10:34 AM
My guess is that you'd be OK 'cause you're not putting all that much stress on the bar compared to an aero bar. BUT, I'm not the engineer that designed the bars either.

Thought about emailing Easton? They may know better than we do.

If there's slipping problems, maybe a piece of skateboard grip tape (or something similar?) wrapped around the bar before mounting the levers would work?

Mike
carbon and MTBatpjunkie
Jan 12, 2004 10:28 PM
remember MTBs have susp. forks which will absorb most of the 'big hit' before the bar. Stress is severly reduce before it reaches this point. (your hands)
I called the Easton rep...TFerguson
Jan 13, 2004 8:47 AM
"Not recommended in any way and will void the warranty."

TF
I called the Easton rep...atpjunkie
Jan 13, 2004 11:54 AM
and besides who wants the weakest link on a fast bumpy section to be at the controls. or snap a bar while sprinting for the finish. If you've ever broken a bar or witnessed it....not pretty.