2019 evo nitro speed

Trek69

New Member
Purchased my nitro about 6 mos ago. Having trouble reaching 28mph in top gear with full pedal assist flat ground no wind. Any suggestions/comments. Should I try Red Bull?
 
Should I try Red Bull?
What was your maximum cadence?
I don't want be obvious but the pedal assist bike will only run as fast as crank rotational speed multiplied by gear ratio multiplied by wheel circumference. In case of BH Evo Nitro Speed it is 48-cog chainring and 11 cogs in the cassette in the top gear. Now, the bike has 28 x 2 tires. Online cadence calculator such as this one:


tell us you need to rotate your crank at 77 RPM to reach 28 mph. Could you do that?

Honestly, I do own a very similar bike which is Specialized Turbo Vado 5.0 and I could only reach 26 mph in conditions similar to yours and was too weak to pedal at 77 RPM in the top gear...
 

opimax

Well-Known Member
I have one, able to get to speed on flats not too hard, 63 and crappy knees. I see you are in VA , I am in VA also, metro DC , happy to get togerther and swap bikes for a ride my bike seems to off on the odometer 50 miles rides show 47 based on mile markers on the W&OD trail, actually could be going a little faster in theory. I think iam having Torque sensor issues on mine and the motor only seems to only want to go fast or off , no in between, might be why I able to get to speed ???? My Stromer is stronger but in the shop as usual. contact me if you would like to try this
 

Ebiker01

Active Member
I reach 31-32 mph . Hv a 53t ring.
Before it was okay doing 28-29mph with rpm above 70. In level 3PAS.

Your weight may be a factor. Above195lb it would pull a little slower.

Is arguably the best , most economical , high end specd and reliable speed pedelec out there.

And is already a “classic” as it is not made any longer😉
The battery can be upgraded to 673wh for only 298$(Fth power).
Is also a great ebike for upgrading to a 52v / 1kw motor with a 52v 30ah controller . That would do 35mph on flats. For only 5k total (1k the upgrade).
 

Ebiker01

Active Member
What was your maximum cadence?
I don't want be obvious but the pedal assist bike will only run as fast as crank rotational speed multiplied by gear ratio multiplied by wheel circumference. In case of BH Evo Nitro Speed it is 48-cog chainring and 11 cogs in the cassette in the top gear. Now, the bike has 28 x 2 tires. Online cadence calculator such as this one:


tell us you need to rotate your crank at 77 RPM to reach 28 mph. Could you do that?

Honestly, I do own a very similar bike which is Specialized Turbo Vado 5.0 and I could only reach 26 mph in conditions similar to yours and was too weak to pedal at 77 RPM in the top gear...
You could put a bigger ring (which due to the midmotor mount may not allow it) and then it is easier to do a 52x14 or 52/15 at 75-80rpm. Or even 50t ring . That is probably easier .
 
You could put a bigger ring (which due to the midmotor mount may not allow it) and then it is easier to do a 52x14 or 52/15 at 75-80rpm. Or even 50t ring . That is probably easier
Oh, I don't think so @Ebiker01. 52x14 requires 92 rpm, 52x15 needs 98 rpm, it takes 95 rpm with 50x14 to reach 28 mph. It is the small cog that makes the speed.

The whole point of gearing is to help the rider find the sweet spot between grinding and spinning. But it is all down to the power delivered to the drive-train. The aerodynamic drag depends on speed in square power, it is the cube for the power demand. That is, reaching 28 mpg requires so and so watts of power.

Is it Nitro or Vado, regardless of the nominal motor power both deliver so and so watts in turbo mode maximum but the assistance drops gradually before reaching 28 mph and it shall be zero at 28 mph (general principle of PAS - same happens to ebikes restricted to 25 km/h or 20 mph depending on the region). So, the motor delivers a lot of power at say, 24-26 mph and pedalling is only necessary to tell the controller you want to go fast. Yet, while approaching 28 mph you have to pedal stronger and stronger to make up the decreasing power of the PAS. Not every rider can provide so much of power.

So, you either need to grind (your knees will say thank you very much) or spin but then you feel quite high resistance from the pedals and you might not be able to pedal so fast. However, even with moderate tailwind or a minor downward slope you can reach or exceed 28 mph easily, as the resistance/drag decrease.

That is why I asked @Trek69 if he could pedal at the cadence of 77 in the top gear of his Nitro because I know what top gear ratio and wheel size are in his Nitro. (He also should pump the tires to the maximum allowable pressure to reduce the rolling resistance, mine are by 7 psi less than allowed).
 
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Ebiker01

Active Member
Oh, I don't think so @Ebiker01. 52x14 requires 92 rpm, 52x15 needs 98 rpm, it takes 95 rpm with 50x14 to reach 28 mph. It is the small cog that makes the speed.

The whole point of gearing is to help the rider find the sweet spot between grinding and spinning. But it is all down to the power delivered to the drive-train. The aerodynamic drag depends on speed in square power, it is the cube for the power demand. That is, reaching 28 mpg requires so and so watts of power.

Is it Nitro or Vado, regardless of the nominal motor power both deliver so and so watts in turbo mode maximum but the assistance drops gradually before reaching 28 mph and it shall be zero at 28 mph (general principle of PAS - same happens to ebikes restricted to 25 km/h or 20 mph depending on the region). So, the motor delivers a lot of power at say, 24-26 mph and pedalling is only necessary to tell the controller you want to go fast. Yet, while approaching 28 mph you have to pedal stronger and stronger to make up the decreasing power of the PAS. Not every rider can provide so much of power.

So, you either need to grind (your knees will say thank you very much) or spin but then you feel quite high resistance from the pedals and you might not be able to pedal so fast. However, even with moderate tailwind or a minor downward slope you can reach or exceed 28 mph easily, as the resistance/drag decrease.

That is why I asked @Trek69 if he could pedal at the cadence of 77 in the top gear of his Nitro because I know what top gear ratio and wheel size are in his Nitro. (He also should pump the tires to the maximum allowable pressure to reduce the rolling resistance, mine are by 7 psi less than allowed).
Actually at 28mph, with a 52/11 , it will keep pulling as is 860watts peak in that Pas level. It runs much different then the Specialized motor. It pulls nicely even at 30mph on smooth flat road with slight or no headwind. When i had the 48ring i had to pedal fast to do 28.9-29.5mph. That was 48/11.
The Specialized can only do the peak power for up to 2minutes and that is 600watts ,much less then 860watts.

As car as tires -I do run the Specialized electrak 2.0 38c in the front (the slick version ,older one) and the electrak 2.0 50c . Very good and reliable tires !

The motor does pull higher then 28mph wether it is a 48t or 52t ring. But with the smaler ring you have to pedal much faster. On Specialized it will stop pulling before hitting 28mph.

The Nitro has a Japanese Motor - Dapu . 500watts but peak is 860watts in 4 PAS. I wished they used the 750wattts one and configure it with 1kw peak.
It is labeled as Made in China but All the internal are made in Japan. That’s why it will last 20-30k miles. I already did 8-9k miles with mine’s.

With The bigger ring, the motor will do most of the work in 52/11 providing you keep some pressure /rpm >70 on the pedals. Try changing the ring and lmk. The 3piece crankset is useless lead weight as that is for mtb. Not sure why they put such a heavy clunky component on a nice commuter ebike.
I run a double crankset now, 2lb lighter then the older one.
 
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opimax

Well-Known Member
I thought it an error that it pulls past 28 , I agree it does. I am thinking about a larger ring at some point next summer season
 
What is the reputation of DAPU motors? I ask because Czech manufacturer Lovelec puts DAPUs in their e-MTBs and the price of the bike is just $2230. Of course, these are not full suspension bikes.
 

Trail Cruiser

Well-Known Member
Like most speed pedelec ebikes, 28 mph is attainable with a rider that is of average weight and physical fitness. I would assume it would full into the category of 160-180 pounds rider and able to physically pedal 200 watts from your leg muscles, on top of the electric motor's own power.

I have an ebike with BBSHD and capable of going 35 mph on the flat. However, I still turn the power down to 20-22 mph for optimum battery range. For me, it does not make sense going faster (unless you're going downhill) and lose significant battery range in the process.
 

Ebiker01

Active Member
What is the reputation of DAPU motors? I ask because Czech manufacturer Lovelec puts DAPUs in their e-MTBs and the price of the bike is just $2230. Of course, these are not full suspension bikes.

It has all japanese components. Is very good.
This ebike sells new for 3499$+tax.
But no crazy power like a Crystalite 3kw , Grin hub motor. Those are for DIY people.

this Lovelec S pedelec😉 ?
Nice components (Shimano Slx, integrated display) a little small battery for 624wh for 2020.
 
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Like most speed pedelec ebikes, 28 mph is attainable with a rider that is of average weight and physical fitness. I would assume it would full into the category of 160-180 pounds rider and able to physically pedal 200 watts from your leg muscles, on top of the electric motor's own power.
Some of us are rather old, ill and these of us changed to e-bikes ;-) If I had that physical prowess, why should I use an e-bike? 24-26 mph is what I can achieve with my Vado.