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Mounting fenders on a 2008 Cannondale CX9 cyclocross frame

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Mounting fenders on a 2008 Cannondale CX9 cyclocross frame

Old 12-07-16, 04:53 PM
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Mounting fenders on a 2008 Cannondale CX9 cyclocross frame

I'm trying to install Plant Bike Cascadia fenders on my CX9 frame with an Easton EC90 carbon front fork. The mounting hardware doesn't screw into the threaded mounting holes on the front fork and rear dropouts. Can anyone tell me what size bolts are used on this frame? Secondly, there seems to be a hole on the back of the front fork that can be used to mount a front fender. A screw lightly threads in but it doesn't sit flush. I suspect you're suppose to put in a rivnut then screw a bolt into that, similarly to bottle cage mounts.

Any help is greatly appreciated.
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Old 12-08-16, 12:34 AM
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Originally Posted by Bumnah
I'm trying to install Plant Bike Cascadia fenders on my CX9 frame with an Easton EC90 carbon front fork. The mounting hardware doesn't screw into the threaded mounting holes on the front fork and rear dropouts. Can anyone tell me what size bolts are used on this frame? Secondly, there seems to be a hole on the back of the front fork that can be used to mount a front fender. A screw lightly threads in but it doesn't sit flush. I suspect you're suppose to put in a rivnut then screw a bolt into that, similarly to bottle cage mounts.

Any help is greatly appreciated.
The usual bolt size is M5 for racks and fenders, and since the frame and fork are different manufacturers, I would be really surprised if they both deviate from that. Your local hardware store should have metric stainless cap head bolts in the bulk hardware bins, and they aren't too expensive, so you can try a few different lengths to find one that threads through the fenders and the frame eyelets.

I'm not sure why the bolt wouldn't sit flush, but perhaps that spot isn't for mounting fenders? If you post a pic it would be a lot easier to understand your scenario.
Good luck!
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Old 12-08-16, 10:35 AM
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could be M5, or could be M4.
Could also be tapped for M5 and heavily painted.

I suspect you should be using a concave front brake bridge washer for the fork hole to give you a flat boss for the fender bracket and fastener.
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Old 12-08-16, 10:45 AM
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I've had an experience with Cannondales where the fender hole in the dropout went through the derailleur hanger. The hanger had enough play that, as it stood, the hole in the hanger didn't quite line up with the hole in the DO. The QR and hanger would need to be loosened to get the bolt started, then it could all be cinched down again. Can't say if that's the issue here because I'm not familiar with this bike specifically.

Also have had paint in the holes.
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Old 12-09-16, 07:51 AM
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does the fork have mounting holes midway up?
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Old 12-12-16, 10:04 AM
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Measurable success:



The issue with the mounting holes was paint. Front and rear fork mounting holes are the same thread pitch as the bottle cage bolts. I used an old bottle cage bolt and slowly torqued in and then backed out the bolt to break up the paint on the threads. Rear holes just needed a little cleaning and I loosened the rear derailleur hanger to get the bolt properly lined up.

There is a mounting hole on the back of the front fork, the size and thread pitch are different than the others. Digging through an old bucket of bolts should solve that problem as well. I'll update this thread with the size and thread pitch for future searchers.

Last edited by Bumnah; 12-12-16 at 10:07 AM.
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Old 12-12-16, 10:20 AM
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nice color match
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Old 12-12-16, 12:28 PM
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A+ on the white fenders
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Old 12-15-16, 11:39 AM
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Thanks for the compliments.

Front fork's upper fender mounting hole is M6x1.0. I measured it with a thread pitch gauge and once confirmed I chased it with a tap to clean up the threads. Moments later, success!

I also redid the rear fender. I drilled a hole in the rear fender after measuring the upper mounting location on the rear fork. This allowed me to toss their adapter bracket in favor of a cleaner install. The rear fender sits a little higher than before but looks much cleaner without the odd bracket and zip ties.



Last edited by Bumnah; 12-15-16 at 11:56 AM.
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