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Old 05-12-11, 08:11 AM   #1
Shurafa
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A2B UltraMotor Modification Help?

I just purchase and A2B Metro http://ultramotor.com/us/product/a2b..._specification and have been really enjoying it! There are a few things I would like to change. I have been ridding for 20 years but I am an Bike Mod newbie so please do not assume that I know anything... :-)


1. Shocks
2. Cranks

1. I would like to be able to ride someone on the back of the bike! When I do this now the shock sags to the bottom and the bike will not accelerate reliably. I tried it with the stock shock as well 2006 Manitou RADIUM RL 152 x 32 C8X40 Rear Air Shock http://cgi.ebay.com/ws/eBayISAPI.dll?Vi ... c9E9A%253D . The performance on the Manitou's shock is even worse. Do they make shocks that have a lock out? The problem with Air shocks that lock out is that they are a "soft lock" and still compress if pressed too hard? What do 300lbs+ people do for full suspension rides?

2. I find that the stock cranks do not provide enough torque. I found someone else who did a mod to this bike here http://endless-sphere.com/forums/vie...20991&start=15 The cranks he bought look solid If anyone knows the name and/or has a link to where you an get them it would be much appreciated. Would any 50T crank work or do I need to look for something special?


Thanks for your help it is much appreciated!
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Old 05-12-11, 09:04 AM   #2
dabac
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Quote:
Originally Posted by Shurafa View Post
I just purchase and A2B Metro http://ultramotor.com/us/product/a2b..._specification and have been really enjoying it!
That's an electric bike, this forum deals mainly(if not exclusively) with human powered bikes. You may have better luck elsewhere.

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Originally Posted by Shurafa View Post
1. I would like to be able to ride someone on the back of the bike!.. When I do this now the shock sags to the bottom
Well, take a shock only intended to be used on a one-rider bike and stick two riders on it and that is hardly a surprising outcome. If it is an air shock you can try pumping it harder. Don't blame me if you blow the seals though.

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Originally Posted by Shurafa View Post
I would like to be able to ride someone on the back of the bike! When I do this now ..the bike will not accelerate reliably.
It hasn't got the power, end of story. Maybe try pedalling simultaneously to help the motor out.

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Originally Posted by Shurafa View Post
What do 300lbs+ people do for full suspension rides?
Dream perhaps? Not many 300 lbs cyclists out there. Or they bite the bullet and buy a scooter instead. Or stay on rigid frames.

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Originally Posted by Shurafa View Post
I find that the stock cranks do not provide enough torque.
Er, what?
Either the gearing can be too low, in which case you'll be spinning your legs like crazy w/o feeling any resistance. Solution: get a bigger chainring or a smaller (set of) sprocket(s). Spinning like crazy means more than 100 turns/minute. If you're below that, do some cadence training instead.

Or the gearing can be too high, in which case all gears will feel too heavy. Solution: Get a smaller chainwheel or a bigger (set of) sprocket(s).

Sometimes the chainring can be replaced separately from the crank, sometimes they have to be replaced together. The ridiculously named "specification" doesn't tell which.
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Old 05-12-11, 03:26 PM   #3
sagg
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Hi Shurafa,

Nice Wheels! I am looking seriously at the A2B Velociti but can only find one review. I think generally the motors and batteries are the same.
How many miles can you go with some light pedalling?
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Old 05-21-11, 11:19 AM   #4
Shurafa
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Hi Shurafa,

Nice Wheels! I am looking seriously at the A2B Velociti but can only find one review. I think generally the motors and batteries are the same.
How many miles can you go with some light pedalling?
I get about 12 miles off the main battery. I ended up getting a second battery which brings the total to 24.
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Old 05-23-11, 05:32 AM   #5
sagg
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Thats a long way from the 20 MPH unassisted that they advertise. I ended up getting the Velociti, super quality bike but disappointed with the 20 KM or so I think I am getting on one charge.
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