fold

Looking for something like attachment but longer(double the length) on 28.6mm end.
It will used to lift handlebar.
thx!

Schwinnsta

https://www.walmart.com/ip/Sunlite-S...&wl13=&veh=sem

rhenning

I doubt that they are made much longer than those two are. Roger

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@Schwinnsta thanks!
I found that one too. But according to Amazon question/answers:
"
Question: What are the dimensions of the thicker part of the extender? Could I mount a thredless stem on it?

Answer1: Pretty sure not. It's not made for that; other stem extenders can be found, that are. For one thing, I this sunlit stem is hollow, meant for an old style stem to be inserted into it, not a newer type to wrap around.


Answer2: The OD of the top portion of the 22.2mm diameter extender is 25.4mm (1 inch).
Not even close to the oversize 28.6mm (1-1/8 inch) diameter required for the threadless stems.
There are some 1 to 1-1/8 diameter handle bar shims that you might be able to use ( Thomson Bicycle Step Shim (1 to 1-1/8-Inch, Black) ).
If you did so then you also need to stuff something inside to insure the tube does not collapse under the clamping pressure.
(hint: 1/2 schedule 40 pipe has an OD of 0.840 inches ... about 0.026 inches less than the ID of the adapter) « Show Less"

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@Schwinnsta @rhenning I found this one: SpeedPark 2052-594

I will have to use current adapter's cap with it though. SpeekPark 2052-594's cap's diameter is bigger than 28.6mm.
You guys think this will work?

BruceMetras

See HERE

rhenning

I will post my answer to this on both of your posts on this.

"I do not believe those adapters are designed to be used daisy chained together. Use one and one only not one on top of another on top of another which is a daisy chain. Please do not quote me on this as I then have to go through and get rid of them on my account. I can and do go back on my own and look at posts. Multiple use of those adapters could lead to a catistrophic failure. They are designed to work with leverage put on by one of them not by several of them. Roger"

Bruces recomendation would be much safer than what you were propossing. Roger

Schwinnsta

I did not mean to imply that they should be daisy chained. I was replying to the first post.

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Thanks @BruceMetras
My goal here is to raise the handlebar. This part you found will lower my handlebar though. Attached please find pictures of my bike. I plan to replace my original adapter with this one SpeedPark 2052-594.

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@rhenning, thanks for the valuable info. Safety does mean a lot to me and my family.
Do you mean that current configuration of my handlebar is dangerous already? I plan to replace current adapter (picture in original post) with longer SpeedPark ; not to daisy-chain more. Is that OK then if current configuration is fine? Please see pictures I posted above for reference.

jur

Folding MTB Mountain Bike Bicycle Adapter Riser Stem Adjust Fit 22.2mm Handlebar | eBay

https://www.ebay.com.au/itm/APOLLO-TR...gAAOSw3mpXJnql

https://www.ebay.com.au/itm/Folding-B...VeQVlrMAkRvgOw

1st one will go in. 2nd and 3rd will go around existing adapter.

BruceMetras

The adapter I linked would raise the handlebar over what you have pictured.. you do know you have the stem facing backwards? How much higher do you want the folding handlebars? 2" 4" 6" 8"? That kind of additional leverage will negatively affect steering rigidity and put undo pressure on the tiny headset bearings .. having the stem pointing at your chest (or higher depending on height of steerer) would also be less safe than having it point forward as designed.

One Second Folding Bike

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Thanks for the follow-up @BruceMetras
One Second folding bike's design for size 14" is very nose-heavy, especially at its handlebar's default position(forward), which is unsafe. I tried to rotate the handlebar backwards to the closest position to seat. In addition, I installed a layback seat-post in order to shift the center of weight backwards. After that the handlebar didn't feel close enough to the seat. That's why I flipped the stem. That link you provided shows 16" bikes. They are less nose-heavy, but I would still use a lay-back seat-post and rotate the handlebar to 'top' or 'backward' position instead of its default 'forward' if I had one. I won't have to have the stem facing backwards though.

As for the part you found, I misunderstood and thought you meant to mount the handlebar directly on that without using my current steerer-tube. Therefore, no daisy-chain would be used. Now I know that you wanted me to replace my current adapter with the part you found. In that case, I need to know exactly how long each side of that part is. To fit my bike, the 22.2mm side cannot be too long and 28.6mm side cannot be too short comparing to my current adapter. I feel that SpeedPark 2052-594 is the right size. Isn't it same as what you found just different in size?

Once I successfully raise the handlebar, I will be able to have the stem facing forwards again.

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It's done. 1 longer adapter + 3 x 20mm Carbon Fiber spacers

https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1

Thanks for all the info!

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Just found from the Internet last night that 'one second folding' bike company has been working on new design to fix the problems I've reported:
a. nose heavy: both handlebar post and seat post's angle tilted more to the back. It is much safer; looks better too!
b. lock problem after folded: the original transition between thick and thin pipes of seat post was causing the bike not fully locked at tightest folding position(there is a tiny travel-distance). The new design fixed the problem by either making the thick pipe longer or/and moving the lock from above to beneath the cross-bar under seat. As a nice side effect, seat post looks stronger and more stable too!

Attached please find some pictures ... one with the lock change, one w/o. The one w/o seems also has fixed handlebar.

I plan to get the new bike after they finalize the design. No major modifications will be required for that ... maybe just some longer fenders. I saw the manufacture had put them on their electrical models...