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Commuting Bicycle commuting is easier than you think, before you know it, you'll be hooked. Learn the tips, hints, equipment, safety requirements for safely riding your bike to work.

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Old 10-31-08, 04:20 PM   #1
ROJA
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Need help mounting PB Superflash (seatpost is too thick)

I am riding a folding bike (Xootr Swift like this one) and the seatpost is too thick to take my tail light mount (Plant Bike Superflash). Because of the geometry of the bike there is no good place to mount it on my rear triangle and I don't have a rack or panniers. Any tips on mounting it to my bike somehow? I usually wear a backpack, but I find that attaching it to my backpack with the belt clip doesn't work very well because it tends to droop and point down and I worry that it will fall off.

Thanks in advance.
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Old 10-31-08, 04:30 PM   #2
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If you're not too concerned about leaving it on the bike, I'd just use two zipties.
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Old 10-31-08, 04:32 PM   #3
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Why won't it work on the seat stay, halfway between the seat tube and the tire?
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Old 10-31-08, 05:01 PM   #4
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I attached a PB superflash to my kid's trail-a-bike on the seat stay. Works great.
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Old 10-31-08, 05:09 PM   #5
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Originally Posted by TromboneAl View Post
Why won't it work on the seat stay, halfway between the seat tube and the tire?
That seat stay is at a really shallow angle; I don't think the mini clamp will hold it far enough away to be able to orient the light vertically so that it aims straight back. It just works on one seat stay on my CAAD8, but on that Swift, it'll be pointing upwards.

Maybe that's a clue, though. Get a small extension of some kind, bolt one end to the miniclamp on the seat stay, then bolt the light bracket to the extension.

So:
miniclamp*||extension||*light bracket

The big, normal-sized clamp won't fit on that seatpost, even without using the rubber shims? 34 mm is a lot thicker than I thought; what about using a longer bolt instead?
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Old 10-31-08, 05:43 PM   #6
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I can get it on the seat stay, but only if it's pretty low (so as not to interfere with the brakes and the folding mechanism). It just doesn't seem as safe to have the light down really low on the frame- I am worried that drivers won't see it as well.

I may try the zip ties or the extension idea. A longer screw *might* work, but I'm worried that it would force me to bend the bracket at a funny angle.

Thanks guys.
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Old 10-31-08, 06:51 PM   #7
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Ah, ok --

Solution #1: Put it on the left seatstay so that more drivers will see it.

Solution #2: Get two lights, one for each seatstay.
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Old 10-31-08, 06:54 PM   #8
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I cut out a wedge from 1/4 plywood, with a tab for the light mount.
The wedge slides under the seat.

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Old 10-31-08, 07:57 PM   #9
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Get a Minoura Space Grip or something similar, mount it to the seatpost or seatstay, and mount the Superflash to the Space Grip.

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Old 10-31-08, 09:48 PM   #10
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Get a Minoura Space Grip or something similar, mount it to the seatpost or seatstay, and mount the Superflash to the Space Grip.

Dude that is a frakkin awesome idea. I have a similar problem with my massive rear suit pannier covering nearly all visible light mounts on my seat stay and rear triangle. I'm definitely going to try that.
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Old 10-31-08, 10:37 PM   #11
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I just used a longer bolt/screw if you have one lying around ...
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Old 11-01-08, 06:31 AM   #12
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Most bike shops have a box with miscellaneous mounting clamps of random sizes lying around. Try taking a measurement of the seat post and see if you can find something you can adapt.
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Old 11-01-08, 05:21 PM   #13
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Great thinking 10 Wheels.
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Old 11-03-08, 12:04 PM   #14
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I just zip-tied mine own.
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Old 11-03-08, 12:58 PM   #15
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Now that I think about it, having anything on the seatpost is going to interfere with the folding process. I may just stick with the rear triangle or I might stick it on my backback (or perhaps I will try the custom seat attachment).

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