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[carrier blocks] Diameter + inner dimensions?

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[carrier blocks] Diameter + inner dimensions?

Old 12-28-23, 01:01 AM
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[carrier blocks] Diameter + inner dimensions?

Hello,

I'd like to add a front carrier block on a no-name folder.

At least four are available: One by H&H, and three by Litepro.

Before ordering, I need to know their vertical inner dimensions, and maximum inner diameter to check if any of them matches the head tube on the bike.

If you have one of these, would you mind measuring the two parameters?

Thank you.


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Old 12-28-23, 01:33 AM
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H&H has 3 different types, one for Birdy 3, one for Birdy 2 and one for the Pacific Cycles Birdy new Classic.

One major difference between the H&H adapters and the Litepro adapters (the one for the Birdy and Dahon/Fnhon Gust) is the tilt they apply to the Brompton front bag block: the Litepro adapters tilt the block and bag much more to the front (so that the top of the bag is at a much bigger distance from the handlebar) which avoid any risk that the bag touch the stem+handlebar but causes steering instabilities when the bag is heavily loaded.
To avoid this effect, the the front of the block and the frame of the bag should be slightly tilted to the rear like on a Brompton, not vertical or tilted to the front (as on the first picture with the H&H adapter mounted on a Birdy 3).

If your stem is not tilted to the front of the bike and if one of the H&H adapter fits for your bike, I would recommend to go with an H&H instead of a Litepro.

Last edited by Jipe; 12-28-23 at 01:37 AM.
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Old 12-28-23, 02:08 PM
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Thanks.

H&H doesn't give the dimensions of the two adapters it makes (inside diameter seems to be 147-107=40mm for the Birdy2 and 56-4=51mm for the Birdy3, but no infos on the inner height between the two rings), and Litepro doesn't give the inner height of its three adapters.
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Old 12-28-23, 06:19 PM
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I think I have the H&H type. I can't see any markings. If you are looking for the length between the flanges in the rear it is 71.12 mm by my Chinese calipers I put one on my Zizzo, before Zizzo made their own. The diameter was not perfect, but close enough to make it work. The tilt was not perfect either, but OK. It also sits too low. If I were to add a front light to the fork, I would have to build a custom mount for the light. Bags sit closer to the fender than on the Brompton. It is quite usable.

I cobbled together my own mount for my Xootr before I had ever seen these, which would not have worked anyway on it. By doing that I could control for all variables and I feel it's more secure and stronger, though quite over built.


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Old 12-29-23, 04:14 AM
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Just to double-check: Is it 71,12mm between the two flanges/rings on the inside?

What material did you use to fill the gap on your DIY adapter?

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Old 12-29-23, 07:41 AM
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First picture: The 71.12 mm is at the main tube / head tube intersection.

2nd picture: I used a small block of 5/8 inch 6061 aluminum. I used a carbide hole saw bit and drilled a hole to match the diameter of the head tube, as near as I could get to it. I trimmed it to size and cut it in half on a bandsaw. I bonded some rubber from an old inner tube to the curved surfaces where it contacts the head tube. It is screwed into the plate.
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