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PostPosted: Thu Jun 12, 2014 4:52 am 
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Joined: Tue Nov 11, 2003 9:47 pm
Posts: 1718
Location: Santa Cruz, California, USA
The $2.50 a pair for FarSports blue pads really puts a crimp in my cycling.


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Posted: Thu Jun 12, 2014 4:52 am 


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PostPosted: Sun Jun 15, 2014 12:14 pm 
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Joined: Sun Jan 26, 2014 3:44 am
Posts: 115
Some addition info for the thread, based on my own experiences. I only have experience of Far Sports 38mm Carbon Clinchers, so this info only applies to them absolutely, but may be general info for other carbon clinchers.

-Brake pads need a lot more careful consideration than initially thought. There is not a lot of objective info about what brake pads do and don't work with what rims, and using something unsuitable may cause irrepairable damage. I burnt out two Far Sports rims using Swiss Stop Black Prince pads. Nowhere does it say on the Far Sports site not to use these pads, and Swiss Stop themselves offer no warning or info about the compound of the pads. I now use Far Sports pads, and have no problems with melting the braking surface.

-Carbon Clinchers suffer badly (in comparison to tubulars) from spoke tension issues; this is caused by the need for the tyre to sit very tightly on the rim, which compresses the circumference of the rim, which reduces the radius slightly, causing the spoke tension to drop. This is very pronounced on Carbon Clincher rims, and can be a serious issue if you are using a hub with a low maximum tension rating, combined with a lacing pattern which lends itself to a relatively low NDS tension.

An example of this would be, for example, a hub with a maximum tension of 100kg, using a 1:1 DS/NDS spoke ratio. Building the wheel with the DS at 100kg, would have the NDS sitting at about 50-60kg. Once the tyre gets put on though, this tension drops significantly, to the point where you may lose all effective NDS tension. I know, as this happened to me. There are ways around this, by using lacing patterns which give the NDS a proportionally higher tension, or indeed getting a hub which has a higher maximum tension, but this is an issue with Carbon Clinchers, none-the-less.


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PostPosted: Wed Jul 30, 2014 6:34 pm 
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Joined: Tue Mar 18, 2014 4:18 am
Posts: 2
I was afraid of riding carbon clinchers because of failures but when I bought my 2014 Trek Madone 7.9 I opted for the Bontrager D5 cc since I was assured they were better than the older versions. I put 25mm tires on them and really loved them.

I live on the west side of LA and spend a lot of time in the local mountains. I am a very good descender and don't hit the brakes excessively. A few weeks ago, after months with no issue, I had a double carbon clincher fail on a warm day. The front just popped on a descent but I luckily recovered before I crashed. The rear had a slow leak so that may just have been a coincidence. My tire pressure was only around 100 and the rims were so hot to the touch I couldn't believe it.

I'll never ride carbon clinchers in the mountains again until disc brakes become cool. On the flats or rollers I would never worry. I miss the looks but it's not worth risking my life.

I don't race anymore but when I did I raced Zipp 404 tubulars and I nothing I have tried compares to the feel of light aero tubular wheels in my experience.


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PostPosted: Wed Jul 30, 2014 6:46 pm 
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Joined: Tue Nov 11, 2003 9:47 pm
Posts: 1718
Location: Santa Cruz, California, USA
What descent were you going down? Which brake pads were you using?

I've always used aluminium wheels down there when descending roads like Yerba Buena and Deer Creek. I also use aluminium rims up here in the santa cruz mountains as we have some very steep and technical descents.

But I've been ok with carbon clinchers everywhere else including the big climbs in the sierras and the steepest and most technical descent that we race down in NorCal.


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