Bottle cage bolts - Colnago C40

shipley

After wanting one for 15 years, I have finaly got my paws on a Colnago. Its a beautiful carbon fibre C40 with a one-off paint job.

The only thing I need for it is 2 bottle cage bolts. I had some spares but they do not fit. They do however fit my Specialized and Bianchi bikes. I have spoken to several dealers and received the same response

"you need 4 mill mate"

I bought several lenght 4mm bolts but I need the next sizr smaller. The 4mm refers to the allen key bolt size, not the size of the bolt thread itself if that makes sense.

Does anyone know a solution, or what the smaller bolts are called or what their size is ?

litttlestwoo

How about emailing Colnago direct, they might even send you some for free, worth a try

shipley

Hey now there's a thought !!

I'll do that !

Monty Dog

Well, my Colnago has standard 5mm bottle cage screws and never heard any that were different. Mike Perry at Maestro is the definitive oracle on Colnago in the UK - been selling them for longer than anyone else.

davis

I thought Colnagos used M4 bottle cage screws too... just to be different, like

Michael432000

Finally got one myself in beautiful condition however there were no bottle cage bolts on it.

I’m a bit concerned that the threads are damaged as the hole seems to go down several mm before the thread starts.

Anyway I need some bolts first, presumably they are M4?

mrdsgs

just checked my C40, 2.5mm allen key and I think the threads are 3mm, nothing special about the bottle cage bolts, they are just small/narrow. I have got several different styles including rounded low profile that might have come originally with the campag record bottle cages I no longer use. Easy to source I think. mine are about 15mm long threaded.

Alejandrosdog

https://www.pro-bolt.com/

Pimp tastic

Michael432000

Thanks.

Yes M4 bolts.

Fortunately the threads are ok too.

wongataa

Shipley wrote:

I bought several lenght 4mm bolts but I need the next sizr smaller. The 4mm refers to the allen key bolt size, not the size of the bolt thread itself if that makes sense.

Bolt sizes are always the thread size (diameter then length), not the spanner/hex key / tool size. If someone is listing bolts by the size of the tool required to do them up they are not following conventions and are an idiot.

Alejandrosdog

wongataa wrote:

Shipley wrote:

I bought several lenght 4mm bolts but I need the next sizr smaller. The 4mm refers to the allen key bolt size, not the size of the bolt thread itself if that makes sense.

Bolt sizes are always the thread size (diameter then length), not the spanner/hex key / tool size. If someone is listing bolts by the size of the tool required to do them up they are not following conventions and are an idiot.

Plenty of idiots in here

Matthewfalle

Mx

x being the current size that is too big. then work your way down.

#251

Matthewfalle

wongataa wrote:

Shipley wrote:

I bought several lenght 4mm bolts but I need the next sizr smaller. The 4mm refers to the allen key bolt size, not the size of the bolt thread itself if that makes sense.

Bolt sizes are always the thread size (diameter then length), not the spanner/hex key / tool size. If someone is listing bolts by the size of the tool required to do them up they are not following conventions and are an idiot.

this exactly

#251