Recent content by ferrellms

I have a 2016 Turbo X and highly recommend it. It is definitely punchier than the regular Turbo.

OK, good video.

Just because a super powerful hub motor needs to be heavy does not mean it is the wrong choice. For example, a 250 watt hub will be heavier than the mid drive but has other advantages. Your remarks on the Tesla are simply incorrect.

You are incorrect. Electric motor efficiency has nothing to do with rpms.

How many gears in a Tesla? (1) Are they slow off the line? Do they need more gears to climb hills? Lots of posts here assume that Ebike motors need to "spin up" or that hub drives are slow off the line or that one drive train is "more efficient" than another due to torque multiplication that...

The misconception repeated constantly in all these posts is that slower motor spinning speed results in less torque, thus torque multiplication is good via mid-drive or that the hub needs to spin up blah blah. As a matter of fact, DC motors have the same torque at 0 rpm as at all other rpms...

The biggest advantage of mid drive is the more even weight distribution front-back makes it easier to surmount obstacles. For off-road mid drive is the only way. For road and gravel hub drives will work very well and have advantages in terms of reliability and effiiency (fewer moving parts)...

Well, if you look at the name of the thread and the first post, I was specifically calling out ("arguing with" if you will) the claim of the Specialized marketing guy that the mid-drive was "much more efficient" which, given my admittedly sketchy knowledge of electric motors, did not make...

This is right in there with the Wh per mile I get on my Turbo X 2016. I believe that on a flat ride at a moderate speed at 30 eco you could get 100 miles with my bike and the 691 Wh battery. I did a moderately slow ride (12 mph) at 40% in flat Florida and used only 64 Wh to go 12 miles. This...

OK, thanks for the replies. My own research does contradict some of the assertions and speculations, however. Here is the treatise :) Efficiency refers to the ratio of electrical input watts to mechanical output watts. Different motors differ in this regard due to various internal power losses...

So, the Specialized marketing guy says that the Brose mid-drive is much more "efficient" than the hub drives they use now (he is a marketing guy, so what else would he say?). Leaving aside things like weight distribution for off-road riding, riding feel, and so on and focusing on the efficiency...

Hard to see how the battery could make a difference in top speed, given that the nominal voltage output is the same for all the Turbo batteries. I have tried the 3 different Turbo batteries in my Turbo X and haven't noticed any real difference. In each case, the assist stops at 26-27 mph. It is...

Hi, I have used the 3 different sized batteries - Turbo S, Turbo X, and Turbo - in my Turbo X 2016. 2016 Turbo - 468Wh 2016 Turbo X- 562Wh 2016 Turbo S - 691Wh They all work fine and are indistinguishable in use. The smallest won't work with the Mission Control app, the larger 2 will. The...

Ebikes in Brooklyn? Who would of thought?

I have been riding in upstate NY and CT often enough to realize that North-South routes are much easier than East-West! The elevation readouts from the Mission Control app look like perfect sawteeth between 150' and 550'.