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Folding Bikes Discuss the unique features and issues of folding bikes. Also a great place to learn what folding bike will work best for your needs.

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Old 09-21-08, 12:35 AM   #1
jur
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Just a news flash on my folders...

I had some nice weather, some spare time and decided to show some of my bikes' current status.


My Downtube Mini, sporting its new handlepost (remember the original broke off after I crashed in some deep gravel). Look, the chainwheel grew its wisdom teeth - now 53!

Seatpost is in unfinished state, made from a Dahon telescoping post (Thanks Thor). The inner is loooooong and extends all the way into the seat tube; this makes for a stiffer seat post and the extension is waaaay below maximum, giving me peace of mind over not stuffing the frame due the over-extended seat post.




I also installed a folding stem, made from an adjustable stem. The original bolt was replaced by a quick-release.





After dismantling and filing away some material, it folds down all the way so the handlebar is against the handlepost.



I rotated the handlepost through 90 deg so now it folds inside! Compact fold!


Compared against my folded Yeah.





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Old 09-21-08, 01:02 AM   #2
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After SWMBO got her blingy Reach Offroad, she cast off her Yeah like a poor-fitting bra. Expecting this reaction I stepped in smoothly and confiscated the yeah and treated it to some new bits.



It had a Thudbuster seatpost, a standard 31.6mm size mounted in an adapter I made. This adapter bust one day as I rode through a deep pothole; luckily it didn't result in me thudding against the gravel. I already had a 35mm tube with the right inner diameter; so this became a new adapter, longer and stronger this time. A new shim had to be made as the original seatpost is only 34mm. It all works great now.



I installed 2 M5 rivnuts in cleverly selected spots for a water bottle cage, after discovering we had rivnuts and the riveting tool at work.



The drive train was upgraded with XT rear derailer, only the best for me. The cranks were replaced by a Schlumpf Speed Drive (thanks Bruce). It now sports a 510% gear range, same as a mountain bike.



Being a quick compact folder, it became my commuter of the day, especially since I occasionally take the train. A standard Topeak rack was mounted for my matching Topeak MTX trunk rack. I can also hang my panniers with no heel strike.



The bar ends and luggage rack do not interfere with folding, even if I have the trunk rack mounted. Very convenient for commuting - just fold and go.
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Old 09-21-08, 01:13 AM   #3
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My Swift has also gotten some new bits.



It has a Pazzazz seat post, 120mm stem, 60T Vuelta chainwheel and XT Shadow rear derailer. A bottle cage on the stem riser. (Plus a big chunk of wood attached to the left pedal. )


Here's a pic of me during this year's Australian Alpine Classic 200km Brevet, taken shortly after leaving behind a chap on a stainless steel Moulton New Series. Heil Swift!


And one while doing the century Otways Great Ocean Road ride...

Last edited by jur; 09-21-08 at 02:24 AM.
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Old 09-21-08, 01:45 AM   #4
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Wow Jur!
nice tunings, yummi pics
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Old 09-21-08, 03:18 AM   #5
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Very nice folders.
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Old 09-21-08, 05:31 AM   #6
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That folding stem is an awesome idea.
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Old 09-21-08, 10:41 AM   #7
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Good stuff, Jur !!!
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Old 09-21-08, 11:04 AM   #8
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I'm holding off getting myself a folder. Been using my daughters Downtube 8H. But, your photos put the urge just about intolerable. New shinier gear hubs are on their way. At least that's the rumor. I especially liked the pick-a-plank bridge in your photo essays.
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Old 09-21-08, 11:07 AM   #9
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The folding stem is a brilliant idea... why didn't I think of that ?

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Old 09-21-08, 07:26 PM   #10
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Very nice pictures and great ideas.
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Old 09-21-08, 08:34 PM   #11
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Brilliant mods to the bikes.

You are the Master Modder!
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Old 09-21-08, 08:58 PM   #12
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Loving the Quick release setup on the ahead stem there - not unlike the QR on my Aberhallo equipped Mercton... Lateral thinking at it's best!
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Old 09-21-08, 10:35 PM   #13
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Yep the QR idea is unlikely to be my own... I remembered your setup and that set me thinking, and just about simultaneously x136 posted his identical setup which he apparently described before. So ideas get planted even if you don't realise it at the time. Took me quite a bit of searching to find the right kind of stem for the mod - most stems are unsuitable.
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Old 09-22-08, 01:27 AM   #14
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Is that still the Tioga Spider saddle on your Swift, Jur?
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Old 09-22-08, 02:16 AM   #15
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Is that still the Tioga Spider saddle on your Swift, Jur?
Yes, I just took it off for the 24h Opperman ride. Otherwise it's always on.
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Old 09-22-08, 09:22 AM   #16
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Do you still like it? Doesn't their advertisement say it's only good for lasting one season? What's the weight limit on it? Boo hoo, I can't find a saddle I like.
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Old 09-22-08, 12:32 PM   #17
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So, what brand, model and length of stem did you modify? I would like to do the same without using the trial and error method. I just got a Curve SL and would like to get the cockpit of this folder as close as possible to my other bikes. I'm going to capitate the handlebar clamp and attach the ahead type stem to that. I think its 1" (measure twice, cut once)

I found that I need an additional 4 inches of seatpost above the supplied post but I had already planned on installing a thudbuster ST.

Randy

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Yep the QR idea is unlikely to be my own... I remembered your setup and that set me thinking, and just about simultaneously x136 posted his identical setup which he apparently described before. So ideas get planted even if you don't realise it at the time. Took me quite a bit of searching to find the right kind of stem for the mod - most stems are unsuitable.
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Old 09-22-08, 05:49 PM   #18
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This is the stem I bought.


BBB parts have the identical one in their line-up with various lengths. You will also need a 1" to 1 1/8" shim, assuming the Curve stem riser is 1". You could opt to use a 1" tube instead of cutting the Curve stem riser off, couldn't you? then you still have it available. And in fact, on an old Dahon I fiddled with, once I removed the plastic shim inside the handlepost, a 1 1/8" tube fit exactly.
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Old 09-23-08, 02:33 AM   #19
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I have never liked those adjustable stems - too heavy and usually never actually get adjusted once fitted - but now I have seen yours I have found a justification for one. It will go on my touring bike so I can get a rapid change of handlebar position when the riding gets uncomfortable. Ta.

I love the bacon slicer chainring on the Xootr, reminds me of my Moulton days (long time ago).

The Xootr has always appealed to me because it seems to have solved a lot of the problems of a small wheel folder. Your one obviously gets used as a sports bike, so presumably it works. How is it for stuff like creaking etc, and what does it weigh?
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Old 09-23-08, 04:59 AM   #20
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Quote:
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Do you still like it? Doesn't their advertisement say it's only good for lasting one season? What's the weight limit on it? Boo hoo, I can't find a saddle I like.
Yeah, so far it's the only saddle outside the Brooks range I have found reasonably comfortable. It is a little too narrow, though. But somehow it works. I'm don't know what the weight limit is.

I had clean forgotten about the annual thing! That said, I assumed they meant if used for MTBiking. I'll keep an eye on it. It's been about 18 months now, but not even 5000km. It's cheap enough - same as a cassette.
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Old 09-23-08, 05:11 AM   #21
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I have never liked those adjustable stems - too heavy and usually never actually get adjusted once fitted - but now I have seen yours I have found a justification for one. It will go on my touring bike so I can get a rapid change of handlebar position when the riding gets uncomfortable. Ta.

I love the bacon slicer chainring on the Xootr, reminds me of my Moulton days (long time ago).

The Xootr has always appealed to me because it seems to have solved a lot of the problems of a small wheel folder. Your one obviously gets used as a sports bike, so presumably it works. How is it for stuff like creaking etc, and what does it weigh?
Remember that if the stem is rotated the handlebars also do.

The Swift had a few easy-to-cure creaks, one at the interface of seat tube sections (greasy wax cured it) and where the steering riser touches the headset (wax again).

It weighs 8.5kg if I remove all the gadgets such as bottle cage and saddle bag. It is such a pleasure to ride, it affects me like other people get drunk on koolaid, so I get accused of that all the time. I didn't know ALL folders were slower - nobody told me. Must ride slower.
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