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CARBON FIBER FRAMES AND THE DIFFERENCES(6 posts)

CARBON FIBER FRAMES AND THE DIFFERENCESTSuprano
Aug 5, 2003 7:50 AM
I am finally going to buy a carbon fiber frame. I want to know from experience is it better to lug the frame like Trek and Colnago c-40 or is it better to use the monoquoce method.
re: CARBON FIBER FRAMES AND THE DIFFERENCESLC
Aug 5, 2003 8:46 AM
The only time I hear of a CF frame breaking is from impact, so it really does not matter. In the old days before they pefected the glue process the aluminum in the lugs would react with the CF, but now that they know to insulate them better you don't see any lugs coming unglued.
Agree with LC. That said........BIG RING
Aug 5, 2003 9:34 AM
Some of my friend's ride Kestrels which are essentially expanded via air bladder, from what I understand. This is different than the lugged C-40's or Treks. Based on my experience with the C-40 and 5200/5500/5900, the OCLV 120 of the 5200/5500 offer's a very similar ride compared to the C-40. The 5900 is much stiffer and a little lighter. I really like the warranty of the Trek's. If your C-40 breaks, how long will it take to get it replaced?
Agree with LC. That said........JimP
Aug 5, 2003 11:41 AM
The Kestrel and Aegis come from the same background. The original Kestrel engineers split away from Aegis so there is a lot of similarity in manufacturing techniques. The Aegis is actually a 3 piece full bladder molded frame that is not made in halves like some other builders. Since many of the CF frames have similar weights and feel, asthetics and warranty play an important part in the selection process. I personally do not like the look of the C-40 frame where the tubes look like they have been glued into sleeves. I also like to have a good warranty to fall back on if anything does go wrong.

Jim
2 interesting new carbon bikesbigdeal
Aug 5, 2003 12:12 PM
1: Merckx GX2. Pricey, very much so. Carbon mated to aluminum lugs but the meeting point isn't as noticeable as in other bikes.
2: Cervelo R2.5. I read an article on it in the latest cyclesport mag, they apparently added something to the CF to make failure progressive rather than sudden (read explosive).

Neither use bladders.
Not all carbon is the same. Just like metal.maurizio
Aug 6, 2003 9:25 AM
If you really wanted to get nick picky, investigate the actual type and manufacturer of carbon fiber each company uses. Just like metal, not all carbon fiber is the same and to a greater degree, the manufacturing process is extremely important.
To my knowledge, Mitsubishi manufactures the highest grade carbon fiber available. This is primarily used in Formula 1 cars - specificially in suspension systems. Only one bike manufacturer uses this grade of CF and that is Fondriest.
They also employ Minardi Formula 1 people to make thier frames.
I could be way off base here, but it seems to me that this kind of knowledge is extremely valuable considering your butt decending at speed on a 1 kilo frame.
Do your homework if you're so inclined.