CityCyclingEdinburgh Forum » Debate!

Riding without lights

(102 posts)
  • Started 13 years ago by Wilmington's Cow
  • Latest reply from Uberuce

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  1. crowriver
    Member

    Put the wee bottle dynamo lights set on the wee Raleigh folder this afternoon. Just enough room between the rear stays: the left crank has about an inch and a half clearance when the bottle dynamo is disengaged. So a tight fit, but it fits and it works. Schwalbe Marathons have a special strip around the sidewall for engaging the dynamo - nice touch. The front light bolted on to a built in mount on the front rack, the rear one fits neatly in the bolt holes on the rear mudguard. Great!

    By the time I was finished it was twilight, perfect for testing out the new setup. First thing you notice is the increased rolling resistance, and a wee hum as the dynamo rolls on the rear tyre sidewall. The front light is surprisingly bright, and the rear is fine too. They're no halogen beams, but bright enough for town use. Think old school Dutch bike / British roadster and you'll get the picture. No capacitor on these cheapo lights so they go dim when the bike is stationary, and peter out a bit when pottering to a halt. Most of the time they are pretty bright though.

    Went on errands in the dark: delivering a penultimate batch of Spokes newsletters then a trip to the supermarket. Lights were great.

    Not sure how long the lights or dynamo will last, and they haven't been tested in the rain yet. So far though I'm really pleased, especially for the price. Eight quid off fleaBay.


    Dynamo light set

    Posted 13 years ago #
  2. Bhachgen
    Member

    I actually passed a guy cycling on the Ratho-Wilkieston road last Weds with no lights at all. Unlit road, cloudy night (though the moon did come out later after I had passed Ratho) He was riding down the white lines in the centre of the road, probably that was the only way he could actually follow the road. I actually heard him before I saw him, at which point he was probably only 5 yards from me. That road's not too busy with traffic but once he got to the junction with the Newbridge road it would have been a different story.

    Posted 13 years ago #
  3. chdot
    Admin

    More free lights, today -

    Yes, that's a policeman on the left. Didn't see him stopping anyone.

    "Middle Meadow Walk on 2, 9, 16 and 23 November between 4pm-7pm."

    http://lothianbuses.com/news/2-general-news/883-we-are-helping-cyclists-stay-safe-this-winter.html

    Posted 13 years ago #
  4. recombodna
    Member

    Damn missed it again....... was gonna turn up lightless and get some free lighs for the kids.......wot a pikey!! ( other stereotypes are available )

    Posted 13 years ago #
  5. chdot
    Admin

    And today


    Free lights (etc.)

    Posted 13 years ago #
  6. Kirst
    Member

    I was somewhat disappointed with that free lights offer. My fella has left his hack bike at mine (as he lives in Essex and it's a hassle to bring a bike with him every time he visits) and he went on the 9th to see if he could get lights. They gave him hi-viz, but told him he couldn't have lights unless he came back later because if they gave him lights there might not be any for people coming later. If anyone can explain the logic of that to me, please do.

    Posted 13 years ago #
  7. LaidBack
    Member

    Big q of people with no lights across bike bath when I went by.

    I don't know the logic of not giving them away. I'm sure some people have had more than one set by now.....(!)

    Posted 13 years ago #
  8. crowriver
    Member

    Having a wee issue with my (bottle) dynamo driven lights on the folder. Front lamp has started cutting out/dimming intermittently, it's a bit 'bursty'. Mainly occurs at lower speeds or going uphill.

    At first I just assumed it was uneven pedalling action producing bursts of current, as on long downhills the light seems steady and bright. But then noticed (reflected in windows, bus stops, etc.) my rear light is nice and bright as soon as I get moving.

    It could be a loose connection somewhere, but having checked the cables it seems okay. This is a 'single cable' set up, so I'm thinking there may be an earthing problem? Earth directs back to the dynamo through the frame and front rack. Perhaps the issue is related to folder frame hinge flexing slightly when pedalling, which does not occur when freewheeling. This might explain why rear light has no earthing issues.

    I found this link for retro-fitting instructions to make a single cable system into twin cable, and thinking of trying it for the front light.

    Anyone with more experience of dynamo systems care to chip in with comments, thoughts?

    Posted 13 years ago #
  9. Uberuce
    Member

    You could test your theory about the hinge by holding the bike up with the hinge open and turning the pedals by hand.

    Posted 13 years ago #
  10. crowriver
    Member

    It's possible that even with the hinge open, the front light would work fine. Until I wiggled the hinge back and forth that is. What I suspect happens when the two parts of the frame move against each other slightly, the earth perhaps re-routes or the circuit is broken/strength of current weakened slightly, causing the light to momentarily dim or flicker out briefly, then back on. End. Loop. Repeat.

    Doesn't happen when freewheeling, even when not particularly fast.

    Posted 13 years ago #
  11. crowriver
    Member

    My intermittent issue seems to be dependent upon weather conditions. Nice and dry: light is as bright as a small moon. Wet and windy: flickering like an old silent film. So it appears that I may instead have an issue with the bottle dynamo slipping on a wet rear tyre, rather than an earth connectivity problem.

    Just after I'd gone and bought speaker cable and nice wee connectors too... Bother!
    (Might just rig up a two cable system anyway when I get a chance).

    Posted 13 years ago #
  12. Uberuce
    Member

    That's no moon..it's a space station!

    Posted 13 years ago #

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