Page 1 of 1

what is in this bike (an elecTrek)? Voltage for hubs?

Posted: May 11 2016 9:17pm
by DrInnovation
Looking to replace my Lashout (it runs fine but I keep having to replace the planetary gear .. guess its my 200+ pounds and 10% grades.. (I'll fix it up and sell it for lighter people or flatlanders..)

Looking for an inexpensive but reliable replacement. Can anyone identify this bike
Image
http://boulder.craigslist.org/bik/5554939266.htm
The owner does not know what is the drive/watt or battery type.. I need something that can climb big hills (but short commute). It look to me like some type of mid-drive. And in general bikes Trek is a decent brand. I


Unrelated.. I'm looking at some hubs as well. All the 1000w seems to be 48v. If just do a hub on an existing bike I'd hope to reuse by current Battery which is LiPo +BMS system, 7s (25.9.. nominal up to about 30..)
In my current commute I normally charge to about 29.5 and discharge to 28 or so.
Could a 48v run on 25-30v? Can one run a 36v hub on 25-30v ? Is so what is the power loss for hill climbing?
Can most 24v hubs handle 30v or so?

Re: what is in this bike (an elecTrek)? Voltage for hubs?

Posted: May 12 2016 7:05am
by dogman dan
The "48v" hubs will need at least 12s battery. the low voltage cutoff will be too high for any less.

Some bikes/kits can run 36 or 48v. they can run on 10 s minimum.

The trek is likely to be a very old school system. Likely 24v. it should be a worm drive type mid drive, notoriously loud.

I gave away a similar one last year, showing how much I value that kind of bike. But it will climb a hill. That's for sure, like all mid drives can. Just watch out for amp spikes from too high a gear, which blows controllers real easy on this type bike.

I'm just saying, 50 bucks tops, if you buy that thing.

Re: what is in this bike (an elecTrek)? Voltage for hubs?

Posted: May 12 2016 7:19am
by DrInnovation
dogman dan wrote:The "48v" hubs will need at least 12s battery. the low voltage cutoff will be too high for any less.

Some bikes/kits can run 36 or 48v. they can run on 10 s minimum.

The trek is likely to be a very old school system. Likely 24v. it should be a worm drive type mid drive, notoriously loud.

I gave away a similar one last year, showing how much I value that kind of bike. But it will climb a hill. That's for sure, like all mid drives can. Just watch out for amp spikes from too high a gear, which blows controllers real easy on this type bike.

I'm just saying, 50 bucks tops, if you buy that thing.
Thanks.. since they want $420 for the trek I'll keep looking. Don't want something in an integrated but easily destroyed controller.