...Perhaps it will have a sister bike called posh.

 

I think 'Posh' would be the Agattu

Edited July 28, 200817 yr by JohnInStockie

I this Posh would be the Agattu

 

Actually the posh has been here for some while, it's the Kalkhoff Tasman.

 

Chris, the chainring is a special spline mounted one on the Panasonic unit. It would be possible to have a dual or triple special, but very unlikely for two reasons. The chaindrive relationship between the motor and chainring would be changing all the time, altering the character of way the power applied and that would disrupt the riding rhythm. Also the mounting of the chainring isn't directly on the pedal shaft but on a freewheel collar with it's own bearing. I don't think that would be stable and long lasting with multi chainrings.

 

There is a very fast version of the Panasonic made by BikeTech, the Flyer S, where speeds in the order of 20 to 30 mph are the norm, so that's a possibility, motor and pedal based speed performance rather than pedal only based.

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Edited July 28, 200817 yr by flecc

It would be possible to have a dual or triple special, but very unlikely

 

Has anyone with a Panasonic powered bike considered replacing the Shimano hub with a SRAM Dual Drive? Would that not re-create the range of gears similar to a triple front chainring? What would that do to the bikes' performance?

Edited July 28, 200817 yr by halfmedley

Has anyone with a Panasonic powered bike considered replacing the Shimano hub with a SRAM Dual Drive? Would that not re-create the range of gears similar to a triple front chainring? What would that do to the bikes' performance?

 

Yes, there are a number of owners with the SRAM DualDrive on Lafree bikes with the Xtracycle extension. It's better done that way since it gives a longer chainrun for the derailleur to work well without having to fight the idler on the Panasonic unit.

 

One owner I met reckons it's an ideal pairing, and William Morrison in the USA uses one of these outfits for his daily commute and runs at over 20 mph for quite a lot of the time.

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Speed

 

Just seen this thread so a small point about speed, which John has mentioned.

 

Flecc clearly has inside knowledge because I thought I was the only one who knew this, but AtoB have indeed found Cytronex to be the fastest ebike so far. I don't want to pre-empt their publication too much, but I do know the results. The 175rpm bike that John uses came ahead of all the others in the road legal category of electric bikes and not far behind the unrestricted Torq. Then they swapped the front wheel with the fast motor I supplied - I can only say that the margin was wide!

 

We do have the 190rpm in stock and will be selling this as an additional (it only take two minutes to swap a wheel) once we are happy with the legalities.

 

Regards,

 

Mark

 

Then they swapped the front wheel with the fast motor I supplied - I can only say that the margin was wide!

 

Regards,

 

Mark

 

So David told me Mark, impressive results.

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Was the fast motor you supplied AtoB 190rpm, or higher?

 

Stuart.

Could anyone hazard a guess at what sort of hill the higher RPM motor would be capable of tackling. I'm in Canterbury, so don't really have anything too severe but, it needs to be able to give reasonable assistance up relatively long, but gentle inclines.

 

Also Mark, by additional do you mean that the higher speed motor can't be bought as the sole motor for the bike?

 

Thanks

 

Matt

Was the fast motor you supplied AtoB 190rpm, or higher?

 

Stuart.

 

David said it was a 190 rpm.

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Thanks - it wasn't totally clear. Thats very interesting.

 

Stuart.

David said it was a 190 rpm.

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That has been my experience, the 190 rpm version will lose very little in terms of speed compared to the torq. I found almost identical times when going to work, 40 mins. Not sure about the legality as it will go 17mph assisted,

 

Not sure about the legality as it will go 17mph assisted,

 

I can't see that as a problem Hal. Bikes that are governed only by the speed the battery nominal voltage drives them at can be much faster with a full battery.

 

The Quando does 17 mph withour pedalling on a full battery initially, and hot off the charger 18 mph can be seen on the flat. The same is true of the eZee Sprint, both governed only by voltage and tending to drop towards 15 mph as the battery empties, ending up at 14 mph when the battery is on it's last legs.

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This is interesting........

 

Yes I have changed the sprocket to 18 tooth as it was impossibly undergeared for me.

 

The point about the Tongxin is that WITH YOUR INPUT it will scoot up to 22-23 mph with ease. With all other hub geared bikes you fight it at anything above the cut off speed - not so with the Tongxin and makes it a very attractive option as an 'assisted' normal bike. I certainly find the Agattu does feel heavy to ride fast all the same, but as I say it may have a fault somewhere. Having just re-built a light weight racer I find it amazing how wasteful electric bikes are. It it very enjoyable when you feel all your effort is going into forward motion - on the flat at any rate - hills are another matter.

 

Harry, if I understand it the likes of the Tongxin powered Cytronex phases down the power until at 15mph you are on your own. Am I right in thinking that you are describing a scenario where the hub motor continues to supplement the rider input at speeds above 15 mph?

I'll jump in for the moment pending HarryB being online.

 

The Cytronex Nano 175 rpm motor only assists to around 15 mph or a touch over. What Harry is remarking on is the fact that the Nano motor is drag free compared with other e-bike motors, enabling pedalling the bike to much higher speeds in exactly the way any unpowered bike can be. Like all hub motors, it will spin up to higher speeds off-load with the wheel lifted up, but there's little useful power there.

 

There's an alternative 190 rpm "off-road" motor which will run to around 17 mph or so.

 

The lack of drag results from the Tongxin Nano's unique roller drive and freewheel system. Other motors have geared drives, and the freewheels often only disconnect the motor, still leaving orbital gears engaged with the hub and running at all times. These can make pedalling to higher speeds more difficult.

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Edited April 29, 200916 yr by flecc