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-   -   Women's Autobike (https://www.bikeforums.net/bicycle-mechanics/1131621-womens-autobike.html)

originalowner 12-27-17 06:06 PM

Women's Autobike
 
After I bike at a higher gear and then have to coast or slow down, the bike will drop a gear or 2 or 3 and it is painful. It takes 3 or 4 pedals to rebuild my momentum. How do I fix it?

DiabloScott 12-27-17 06:28 PM


Originally Posted by originalowner (Post 20075180)
After I bike at a higher gear and then have to coast or slow down, the bike will drop a gear or 2 or 3 and it is painful. It takes 3 or 4 pedals to rebuild my momentum. How do I fix it?

That's what is supposed to happen... that's what they marketed it to do, presumably that's why you bought it.

I'm not surprised you don't like it though.

xenologer 12-27-17 08:12 PM

Manual shifters, so -You- get to decide what gear to be in.

Andrew R Stewart 12-27-17 09:13 PM

The Auto Bikes I have sold (GT had one in their Airstream line in the late 1990s) had a sort of adjustable shifting point. The adjustment changed the wheel RPM that the shifter would react to, and perform a shift. The few we sold and the many we serviced had some negative comments from owners. But the comments were never offered without our asking first how the rider felt about the bike. The majority of riders either didn't seem to mind the auto shifting or didn't even think about it. A product which did offer an answer even if it wasn't to the question "real bikies" thought was the question.Andy

Gresp15C 12-27-17 09:27 PM

For the curious (since I had to look it up), this for-sale ad has some close up pictures of the mechanism.

https://budgetbicyclectr.com/autobik...g-bicycle.html

leob1 12-28-17 09:19 AM


Originally Posted by originalowner (Post 20075180)
How do I fix it?

Ride it to your local scrap yard. Leave it there and hitch hike to your local bike shop, buy a new bike.

xenologer 12-28-17 10:57 AM


Originally Posted by Gresp15C (Post 20075478)
For the curious (since I had to look it up), this for-sale ad has some close up pictures of the mechanism.

https://budgetbicyclectr.com/autobik...g-bicycle.html


Interesting!
that's a different mechanism from the Landrider (another automatic shifter)

Looks like they use a low-normal rear derailer
then have spoke weights linked to a large movable 'dork disk' which slides laterally to oppose the derailer
I'd imagine it rubs a lot given that the disk spins with the wheel while the derailer doesn't...

Doesn't look like it has a shift calibration; maybe hackable by altering the spoke weights?


Again, Just get Normal Manual Shifters.
You're not happy with when the autoshifting is changing gears; means you've graduated to the point where it's time to take control and do the Shifting Yourself.

Gresp15C 12-28-17 11:18 AM

Just a thought that if the mechanism worked satisfactorily in the past, but not today, it might be a simple matter of lubrication.

bradtx 12-28-17 12:13 PM

originalowner, I haven't worked on an Autobike in years (Used sliding weights mounted to spokes.), but I don't think the shift points can be altered except for changing the weight of the sliding weights. To shift to a higher gear sooner, or to remain in a gear when slowing slightly, try adding some weight to the centrifugal weights. You could experiment using solder coiled around the spoke and attached to the existing weight.

Brad

Gresp15C 12-28-17 01:59 PM

Another way to effectively change the shift points in terms of pedal RPM would be to try a different sized chainring.

xenologer 12-28-17 07:56 PM

From the stock photos, the Autobike uses a rivited chainring

I'd imagine replacing the entire crankset is prohibitive compared to the value of the bike....

Glennfordx4 12-29-17 08:28 AM

I don't remember any of the auto bikes I've worked on having adjustable shift points either, anymore I strip them for parts as we have a few people around here that ride them still and we keep them going.

Glenn

Dan Burkhart 12-30-17 05:35 AM


Originally Posted by xenologer (Post 20077385)
From the stock photos, the Autobike uses a rivited chainring

I'd imagine replacing the entire crankset is prohibitive compared to the value of the bike....

Yeah, especially since they used a proprietary freewheeling crankset and a fixed cassette.


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