Woosh Bikes

[Andy88]

Trex when will those new models be available? Im not back in the UK till February

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[trex]

the Big Bear are in stock.
The new model with the RST Omega fork is the 2017 Bermuda, in new frame shape, matt black, from beginning of February.
RST Omega fork:
https://www.bike24.com/p2152321.html
Bermuda:
http://wooshbikes.co.uk/?bermuda

 

[Andy88]

Do u have a price on the Bermuda yet?

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[Andy88]

Big Bear still suits me better

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[trex]

they are all about the same price. What makes the difference is the motor (£20 for the Big Bear). The Bermuda can be supplied with either 13AH or 15AH (+£60).

Big Bear still suits me better

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Yes, I think so too. The Big Bear has excellent acceleration.

 

[Wingreen]

Unfortunately, it is a very heavy bike at around 26kgs so it isn't the easiest machine to manoeuvre on to high-mounted cycle carriers, even if the weight is within the permissible limit.

Tom

If you need to transport the Big Bear I can certainly recommend the Exodus towbar carrier. At £60 its a no-brainer - though you would need a towbar. I can also vouch for the Big Bear. It has taken me along some fairly rough routes and come out the other side unscathed.

http://www.halfords.com/cycling/bike-racks/towbar-mounted-bike-racks/exodus-2-bike-towbar-mounted-cycle-carrier

 

[Trevormonty]

I


Most hub drives are banfun? Can anyone tell me the crucial components for upgrading to make the bike as comfortable as possible?

Andy

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Gore TeX rain coat and leggings, wellys, thermal underwater, good gloves.

For bike Suntour NCX suspension seatpost, brilliant on rough surfaces and poor roads.

The cheaper derailuer gear sets are not any less reliable than high end stuff for daily commutes. It is quality of shifting is were higher end components shine. An ebike allows you to hold gears longer so less shifting required.

For MTB it is different, suspension is critical air shocks minimum ideally mid to high end. Also good quality gears, as you will be doing a lot shifting even with motor.

 

[trex]

the wide range of assist means that you hardly ever need to change gear on the Big Bear. You just select one that suits your cadence then keep it as long as you like. On hills, you can use the throttle to adapt the assist to the gradient and keep to the exact same speed. It'll climb 8%-9% hills at 15mph. A hub gear will reduce maintenance a little bit because you can have enclosed chainguard but would add about £70 to the price.

 

[Andy88]

Trex do you know the maximum output power of the big bear?

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[Artstu]

Trex do you know the maximum output power of the big bear?

That'll be 250 watts Sir.

 

[trex]

that's easy to calculate. Maximum current * battery voltage * motor efficiency.

Maximum current: 20A.
Maximum voltage: that depends on the state of charge of your battery. On a freshly charged battery, you have 41.5V, the voltage sag at 20A is about 1.5V, so maximum voltage is 40V for a full battery.
The maximum efficiency is 85%. That will drop significantly at very low RPM or very high RPM.
Assuming you ride on a flat road on a fully charged battery, you would get near maximum efficiency. The mechanical output is thus: 40V * 20A * 0.85 = 680W.

In practice, you get somewhere in the region of 550W to 680W because your battery voltage will drop a bit with the battery temperature and also, the efficiency drops a bit after 15mph.
It's still a lot more than smaller motors.

 

[Andy88]

Trex do you know the maximum output power of the big bear?

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250w is the continuous power the maximum output will be different.

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[trex]

250W? that what you get when you run the bike in test mode.

250W mechanical + 10% allowance for road friction = 275W mechanical allowed at constant temperature (25 degrees Celsius).
You only have to ride the bike slowly to avoid overheating and never go over 15mph on a flat road.

 

[Andy88]

that's easy to calculate. Maximum current * battery voltage * motor efficiency.

Maximum current: 20A.
Maximum voltage: that depends on the state of charge of your battery. On a freshly charged battery, you have 41.5V, the voltage sag at 20A is about 1.5V, so maximum voltage is 40V for a full battery.
The maximum efficiency is 85%. That will drop significantly at very low RPM or very high RPM.
Assuming you ride on a flat road on a fully charged battery, you would get near maximum efficiency. The mechanical output is thus: 40V * 20A * 0.85 = 680W.

In practice, you get somewhere in the region of 550W to 680W because your battery voltage will drop a bit with the battery temperature and also, the efficiency drops a bit after 15mph.
It's still a lot more than smaller motors.

Ive learnt so much here and now trying to give something back where I can. Thanks everyone

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