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Grrrr.

So there I was on Sunday, setting my bike up for winter by attaching my guards when I happened upon a slight problem, the thread that sits in the 'bridge' between seatsays will not accept the bolt, I get my tap & die set out and then disaster strikes, the whole 'widget' starts to rotate, it having dislodged itself.

In short I then had to drill the whole thing out which has left me with nothing to attach my guard to, I'm off to the LBS later to see if they have a replacement but if not are there any replacements online? It doesn't help I've no idea what it is I'm actually searching for!

12 comments

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cat1commuter [1421 posts] 3 years ago
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I don't understand.

Is this a carbon frame?

Don't you have a brake on the seatstay bridge?

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jova54 [659 posts] 3 years ago
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Can you not just use a plastic bolt and nut?

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Tinternet_tim [118 posts] 3 years ago
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I'm also struggling to picture what you are explaining.
For bikes that dont have mounting points the general solution is to use p-clips. It'll cost a couple of quid and holds racks and guards very securely. Mighr help fix your problem.

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PJ McNally [591 posts] 3 years ago
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put a longer bolt through, and a nut and washer on the other end, maybe?

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jstreetley [63 posts] 3 years ago
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Do you mean a threaded insert that sits in a hole in the bridge between seatstays? Similar to the one that a bottle cage would attach to on the downtube? If so, these are called 'rivnuts', I believe. i.e., half-rivet, half-nut.

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stuartp [68 posts] 3 years ago
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If it is a rivnut I can see the issue, and have had the same with bottle cage nuts.
You are left with very little to grip to drill out the old one, once you have it out you will need a new nut and a tool to insert it.
For the cost of the tool it is generally cheaper finding a bike shop that can do it for you.

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netclectic [134 posts] 3 years ago
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Bike model and pictures might help identify / solve your problem.

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thebungle [103 posts] 3 years ago
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It is indeed a 'rivnut', knowing what it's called certainly makes it a lot easier!

For those unsure from my OP it's be bridge behind the bottom bracket, not the bridge that the brake caliper is attached to.

Simple solution will be a nut & bolt, slighty more elegant solution will be to have a new rivnut installed.

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cat1commuter [1421 posts] 3 years ago
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That's the chainstay bridge, not the seatstay bridge.

Oh, and some mudguard sets, such as SKS chromoplastics, come with a metal bracket that can clip over the chainstay bridge if it isn't drilled. You could use one of those. (Local bike shop may have a surplus one if you don't.)

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therevokid [953 posts] 3 years ago
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thebungle [103 posts] 3 years ago
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therevokid wrote:

here's wot ya need ...
http://www.sjscycles.co.uk/sks-stainless-steel-rear-mudguard-chainstay-b...

Boom!

Thank you.

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issacforce [212 posts] 3 years ago
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just buy a zefal swan rear guard they r fine fits on to ur seatpost