Extra Bottle cage mount

[youngoldbloke]

Those look the business....but for 30.9mm set posts only.... and no link to buy.
and how would you get them on to the frame tubes?

They reminded me of adapters for braze-on FDs though....I might investigate to see whether any of those can be adapted first.

- can only think they are flexible enough toi be opened out enough to go over the tube. Thinks ...... are there any similar seat pin clamps? - grind off raised edge? - drill and fit rivnuts? ......... ?

 

[biggs682]

that sounds much better than drilling frame

 

[02GF74]

^ those clamps can only slide on to an open end tube so cannot be fitted on the down or seat tubes.

what you want is a version of those with a hinge .... or find a pair of old shimano derailleus and chop up accordingly.

can't really see why a rivnut won't work, even in thin tubing won't work - surely with frames already fitted with bottle cage the tube is not thickened up in that area i.e. butted but onlky thicker i.e. butted at the joins?

personally I have given up with carry water o nthe bike - use a bum bag with bottle of for longer journey a cameback type thing ... haven't been out far enough on the road bike to need more than one bottle of H20.

 

[youngoldbloke]

- so how DO these work then? I assume they are flexible enough to be opened out just wide enough to slip over the tube - I have met cable clips, pump clips like that in the past. Or maybe they aren't - which might be why they are not easily available . I haven't tried it, but if you filed the raised edge off a seat post clip - a thin light one similar looking to these, woudn't it allow it to flex? Maybe?

 

[snomaes]

- so how DO these work then? I assume they are flexible enough to be opened out just wide enough to slip over the tube - I have met cable clips, pump clips like that in the past. Or maybe they aren't - which might be why they are not easily available . I haven't tried it, but if you filed the raised edge off a seat post clip - a thin light one similar looking to these, woudn't it allow it to flex? Maybe?

They are alloy and the sides have been machined away, so I have no doubt that I could flex them open wide enough to install on the down-tube. They may bend and distort a little bit, but the screw would pull them back into the correct shape when the screws were tightened in the clamps.

Think about it - if this was not possible, what would be the point in manufacturing these items?

If they could not be flexed open, they could only be put onto the frame before it was welded together/painted etc, so they would be a product with no purpose!

 

[youngoldbloke]

Exactly!

 

[02GF74]

Think about it - if this was not possible, what would be the point in manufacturing these items?

to fit onto a seat post? nearly all bike have one of them.

can't see them flexing enough without snapping to get over a seat or down tube - maybe worth dropping a line to the seller?

 

[youngoldbloke]

Have you ever seen a bottle cage on a seatpost? You would have to have a hell of a lot of seatpost showing to enable fitting a cage and still have room to put in/extract your bottle, I also think it might well foul the back of your thighs.

edit: - on reflection, you could be right of course - 30.9 is a very common seatpost diameter, but there are much easier ways of carrying bottle/s behind your saddle.

 

[zacklaws]

If they could not be flexed open, they could only be put onto the frame before it was welded together/painted etc, so they would be a product with no purpose!

As mentioned they are for seat posts, unless your "tubing" is same diameter as the seatpost they are designed for, If you do prise them open, then you have a problem of needing longer screws to bridge the gap on the clamps if the "tubing" is far bigger than the size they are designed for. Plus you will also have the problem of the "faces" of the clamp not being parallel possibly, so trying to get a screw to fit in both sides of the clamp to engage the thread would be difficult if not impossible without maybe damaging the thread.

I fitted two holders on a frame, and I got two sets of clamps to do it from my LBS, which could be easily made if needed. They were a long strip of very thin flexible metal, with a hole drilled at both ends which were bent outwards 90 degrees which a longish nut and bolt would pass through, which wrapped around the tubing and also held the holder. If I had time I could take a pic and post it, but a bit busy at moment

 

[Klaus]

As mentioned they are for seat posts, unless your "tubing" is same diameter as the seatpost they are designed for, If you do prise them open, then you have a problem of needing longer screws to bridge the gap on the clamps if the "tubing" is far bigger than the size they are designed for. Plus you will also have the problem of the "faces" of the clamp not being parallel possibly, so trying to get a screw to fit in both sides of the clamp to engage the thread would be difficult if not impossible without maybe damaging the thread.

I fitted two holders on a frame, and I got two sets of clamps to do it from my LBS, which could be easily made if needed. They were a long strip of very thin flexible metal, with a hole drilled at both ends which were bent outwards 90 degrees which a longish nut and bolt would pass through, which wrapped around the tubing and also held the holder. If I had time I could take a pic and post it, but a bit busy at moment

Sounds a bit like the hose clips I used .....

 

[zacklaws]

Sounds a bit like the hose clips I used .....

Just googled Hose clips, but what it finds is what I would call jubilee clips but they not what I got from the LBS, but they did say the clips I got are hard to find these days. But what I did find whilst googling, which is similar to what I have, but far better because they are rubber lined so they would not damage paintwork etc is, "P Clips".

Even Evans sell them under the name Tortec P clips for fastening bits to bikes:-

http://www.evanscycles.com/products/tortec/p-clips-ec006759

but google about as they come in all sizes and cheaper than Evans

 

[deggers]

couldnt you braze the an m5 nut to the tube?. no need to drill then and no damage (hopefully) to the wall of the tube

 

[Zoiders]

Riv-nutting a butted frame properly is safer than a using a hose clip or those band on ally clamps around a seat or down tube.

Over tighten a clamp or hose clip and you are going to crush the tube, you are also setting up a stress riser, should you hit something like say...a car, the tube will break at that point.

 

[TheDoctor]

I'd have thought drilling a 1/4 inch hole in a frame might create a stress riser too...

 

[Zoiders]

I'd have thought drilling a 1/4 inch hole in a frame might create a stress riser too...

No it doesn't, you aren't understanding the concept.

Round clean egdes and no creasing or crushing of the tube, the tube keeps it integrity.

Of course you can't keep drilling holes for ever as you reduce the density of the material to point where it loses it weight for weight strength but a few small round holes with clean edges is neglible.

You can band on a bottle cage mount sure but don't use anything that is going to crush or crease a tube or possibly work harden it.

Take a look at a MTB frame with a gusset under the down tube, the end is always left unwelded for the same reason.