What size are the common rack and mudguard fastenings?

garygkn · Post by **garygkn** » 18 Mar 2019, 10:02pm

Hi,
I need to buy fastenings for a rack and mudguards. I don't have the bike with me but when I collect it I want to fit guards and a rack. The bike is a Condor audax model 2002 it came stock with the rack and guards but the fastenings are missing.

M5 rings a bell?

Thank you in advance for any feedback.

Much appreciated.

I'm a trendy consumer. Just look at my Moto G (4) using hovercraft full of eels.

foxyrider · Post by **foxyrider** » 18 Mar 2019, 11:25pm

M5 is most usual but occasionally M6 has been used.

garygkn · Post by **garygkn** » 18 Mar 2019, 11:32pm

Thank you.
I'll get some M5s.

I'm a trendy consumer. Just look at my Moto G (4) using hovercraft full of eels.

Samuel D · Post by **Samuel D** » 19 Mar 2019, 8:27am

Is the chain stay bridge also usually M5 when present and drilled to take a mudguard?

MikeF · Post by **MikeF** » 19 Mar 2019, 8:30am

I think M5 for mudguards generally, but M6 for a stronger rack mount at the bottom. Depends on the frame.

foxyrider · Post by **foxyrider** » 19 Mar 2019, 9:17am

Samuel D wrote:Is the chain stay bridge also usually M5 when present and drilled to take a mudguard?

A simple check is to use a bottle cage bolt which are always M5.

Make sure you get bolts of suitable length, for racks I generally use 15mm, mudguards and everything else 10mm and don't forget washers either!

Brucey · Post by **Brucey** » 19 Mar 2019, 9:29am

the M5 thread that is used on bikes is (with the exception of a few things such as barrel adjusters on some campag mechs, and some ancient Simplex gear levers) M5x0.8mm.

(edit there are also a 3/16" threads -more than one type- that are used on some older frames; but M5x0.8 has been current for at least the last 40 years.)

Its about 99% certain that a 2002 frame would use M5x0.8 threading for the bottle bosses, mudguards, etc.

However some more recent frameset designs have been stricken with the weight saving obsession; I am told that there are now such things as M4x0.7mm threaded mudguard eyes and bottle bosses. Crazy.... :shock:

cheers

PDQ Mobile · Post by **PDQ Mobile** » 19 Mar 2019, 9:35am

For the rack or combined fixing a spot of Loctight or similar thread locker is a good idea.
If clearance permits a slightly longer bolt and an inner nut tightened with "feel" save strain on the eye thread. IMV
Use a high quality bolt

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What size are the common rack and mudguard fastenings?

What size are the common rack and mudguard fastenings?

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Re: What size are the common rack and mudguard fastenings?

Re: What size are the common rack and mudguard fastenings?

Re: What size are the common rack and mudguard fastenings?

Re: What size are the common rack and mudguard fastenings?

Re: What size are the common rack and mudguard fastenings?

Re: What size are the common rack and mudguard fastenings?