Question: on running a 52T 104BCD chainring with a CYC Pro 1 Gen 4

[sladd]

I plan on running 52T 104BCD chainring on a CYC Pro 1 Gen 4 build.........confused on which 219 sprocket I should get for the kit, its affect on speed and torque?

the kit comes as:
53T 219 sprocket with 32 104BCD chainring
63T 219 sprocket with 38 104BCD chainring
72T 219 sprocket with 40 104BCD chainring
Note: CYC pairs them this way cause each one's effective diameter is very similar to each other

I need to run a 52T 104BCD chainring to clear the rear chain stay, so I'll be swapping out the 104BCD chainring that comes in the kit such as 32T, 38T or 40T 104BCD chainring to a 52T 104BCD chainring - my focus is which size 219 sprocket i should pair with a larger 52T 104BCD chainring.

My Question: which of the three 219 sprockets will provide the most torque and which provides the most speed?

I keep getting differing opinions on the larger or smaller 219 sprocket....same say the smaller 53T smaller sprocket has more speed cause more RPM, some say more torque cause more RPM, others say 72T 219 sprocket is bigger, provides more speed, others say it provides more torque.

If I run a 52T 104 BCD chainring diameter is 8.56in with a 53T 219 sprocket diameter is 5.35in - what is impact on torque or speed?
f I run a 52T 104 BCD chainring diameter is 8.56in with a 63T 219 sprocket diameter is 6.29in - what is impact on torque or speed?
If I run a 52T 104BCD chainring diameter is 8.56in with a 72T 219 sprocket diameter is 7.24in - what is impact on torque or speed?

Thanks for your input and happy holidays,
sladd

 

[bengxe]

A bigger 219 sprocket will mean more torque, less speed. I would think you'd want the biggest 219 sprocket and cassette you can fit if you have to use a 52t chainring.

 

[sladd]

A bigger 219 sprocket will mean more torque, less speed. I would think you'd want the biggest 219 sprocket and cassette you can fit if you have to use a 52t chainring.

bengxe thanks for the response, what I'm confused on is.. always thought middrive motor creates torque by spinning, slow turning motor has less torque and puts strain on motor......maybe I'm splitting hairs here....wouldn't a 53T 219 sprocket spin more RPM compared to 72T 219 sprocket and more spins = more torque, also the CYC motor has an 11T 219 gear chained to the 53T 219 sprocket at the crank which behind it would be chainring bolted to a 52T 104BCD chainring running the rear gears...so if the 11T and 53T combination can spin more that would drive the chainring faster in this context, if I'm on my 34T rear cog = more torque, on my 14T cog = speed, or am I missing something......from a gearing perspective the 52T 104BCD has a diameter if 8.6in and the 53T 219 sprocket 5.4in, the 219 gear at the motor probably just a few inches

 

[NexGen3D]

Hi Bud, I just finished installing one of these kits to a 2005 Specialized Enduro, and if you are running a 52t front chainring, then I would go with the larger 219 chain chainring for the X1, if you go with a small one, it will spin your 52t faster, but you will lose a lot of power, a 52t is quite large, and if you use a smaller chainring on the X1 it will struggle to spin it at lower riding speeds, so larger 219 chainring on the crank equals more power less speed, smaller 219 chain ring on the crank equals more speed less power.

The smaller 219 chainrings are better matched for 32 to 38t chainrings, and the larger 219 chainrings are a better match for 44 to 50+, basically the bigger your front chain ring, the bigger your 219 chainring should be to compensate

I'm running a Gates Carbon drive on mine, the front chainring is about the same diameter as 42T, and I have the 53T 219 setup, and a top speed of 157kph is a little obscene and over kill, even in the lowest gear I have, top speed is 50kph, so for me, I would also be better off with the 72T.

I recommend buy a couple of sizes with matching chains, as its the only real way you work out what feels best.

Also, if your a heavy dude, don't expect to much out of this kit, to be honest, I enjoy my Befang Ultra more, the CYC is a little faster, and a little more powerful, but it over heats really easy and it chews power, considering its chugging down 6000w vs 1500w on my Befang and is only around 20kph faster on a bike that weighs half as much, doesn't really fill me with confidence.

Also, something I don't see mentioned anywhere, it has a speed limiter, and a power limiter, when either are hit, it just cuts power like you have switched off the battery, not real good on a full suspension setup, one second you sitting on the rear shock the next it feels like you have pulled the front break on, only you were not expecting it, and your weight is thrown forwards, the power wont return until you reapply the throttle, its not the best feeling in the world and is quite jarring when it happens.

Hindsight, I really should have just gone with BBSHD setup, if your a light weight, then your experience will most certainly be better than mine with the X1, I feel its been designed for more normal people and I'm just way too heavy for it.