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Fender mounting

Old 06-29-08, 10:53 PM
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Fender mounting

I just installed some SKS Chromoplastic Fenders on my bike. The instructions that came with the fenders were not that comprehensive, and I've got a few questions.

The fender came with a bunch of 5mm bolts of various lengths. These thread perfectly into the eyelets on the fork and the dropouts.

I torqued the bolts down.... is there anything else that is needed to prevent them from getting loose? The instructions did not indicate that I should use washers or nuts to secure the bolts in the eyelets. I'm a bit worried about them getting loose and falling out, and having the fenders cause a crash. The bolts I used are not long enough to get a nut on the other side, but they provided a number of extra bolts (and nuts) that are long enough.

I've got a bunch of leftover washers, should I have used those to mount the rear fender stays?

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Old 06-30-08, 12:38 AM
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I use washers on the bolts that hold the stays to the eyelets. No need to thread nuts onto the bolts - they should stay in place just fine. Like anything else, check the bolts once in awhile to make sure they're still snug. If the fenders start to rattle, you know that they're not.
If you're paranoid about it, use a drop of low-strength Loctite on the bolt threads.

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Old 06-30-08, 07:17 AM
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I used longer bolts in the rear since I doubled up both the fenders and a rack using the same dropout holes.

I used thin washers under all the bolt heads I added a nut to the inside of the non-drive side bolt as a precaution since the rack is also held by that bolt. Usually, you can't do this on the drive side as the extra bolt length hits the chain and/or small cog. The drive side bolt has to end just about flush with the inside of the dropout face.

I just used the washers and standard length bolts with no nuts in the front. Nothing has ever come loose.
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Old 06-30-08, 11:21 AM
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Like any other threads on the bike, fender bolts should be installed with a smear of grease to prevent binding and permit better tightening.
I found the rear chainstay bridge bracket to be useless and replaced it with a small ziptie running through a hole 1cm from the end. This is light, rattle-free and invisible.
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Old 06-30-08, 03:58 PM
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When I install fenders, I usually put washers under every bolt head, and apply some nail polish (any colour, even clear) to the bolt before I thread it in. The nail polish acts as an "anti-rattle" agent by locking the threads, while still allowing you to take the bolt out later. Cheaper than loctite, and it works just as well.
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