Low 31.8mm drop-bars: recommended handleposts/stems?
11-29-20, 11:14 PM
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Low 31.8mm drop-bars: recommended handleposts/stems?
I been looking to convert a Dahon Speed to drop-bars. Seems that the ideal height for the bars would be 10"/25.4cm, for me at least. As far as I know, the only way to keep the drop-handlebars securely clamped is to forgo the ability to fold them independently from the handlepost (e.g. no quick-release at the top) - I'm fine with that. So what is the most effective system or component combination? The most obvious to me would be to have a handlepost with a top-portion that is designed for a regular threadless bicycle stem to be clamped onto it, similar to how a quill-threadless adapter works. I've seen one product like that on Ebay but, it was a standard adjustable height, which doesn't go as short as 10"/25.4cm, and also didn't appear to have a hinge.
11-30-20, 07:03 AM
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I am not sure what you are trying to do, but I am using a quick release with an adjustable threadless stem on my folder, which is not a Dahon.
I am using drop bars with an adjustable threadless stem. The bolt that you loosen and tighten to adjust the angle of my stem is M6. That is the same size thread as some quick release seatpost clamps. For several years I have used a quick release clamp on my adjustable stem to make it easier to make my bike smaller when I pack it away without using any tools.
There is risk if you do that, if you accidentally bumped the quick release with enough force to release it while you are riding, you could have a very bad day. So, only try it if you are willing to take that risk.
The lower stem is to mount the handlebar bag, do not let that confuse you, the upper stem that mounts the handlebars is where I have the quick release, in the photo below the lever is visible behind the stem.
I am using drop bars with an adjustable threadless stem. The bolt that you loosen and tighten to adjust the angle of my stem is M6. That is the same size thread as some quick release seatpost clamps. For several years I have used a quick release clamp on my adjustable stem to make it easier to make my bike smaller when I pack it away without using any tools.
There is risk if you do that, if you accidentally bumped the quick release with enough force to release it while you are riding, you could have a very bad day. So, only try it if you are willing to take that risk.
The lower stem is to mount the handlebar bag, do not let that confuse you, the upper stem that mounts the handlebars is where I have the quick release, in the photo below the lever is visible behind the stem.
11-30-20, 08:18 AM
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What I'm trying to do is add drop-bars to a bicycle that employs a folding (or otherwise retractable) handlepost. The adjustable threadless stem that you describe would certainly allow folding the drop-bars independent of the handlepost. The problem is finding a folding/retractable handlepost that accepts that kind of stem. The only one I've found was unreasonably tall for using drop-bars with.
12-05-20, 12:00 PM
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What you need is a handlebar stem that folds to the outside of the bike. Litepro makes them, but I can't seem to locate it on eBay. Try Aliexpress. They should have what you 're looking for, so you can easily use drop bars, and still fold the bike.
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