Pros/Cons of a 44t/22t vs 32t/16t on a mid drive?

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azneinstein   100 mW

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Pros/Cons of a 44t/22t vs 32t/16t on a mid drive?

Post by azneinstein » May 03 2019 12:07pm

So I've been wrapping my brain around this but there are so many factors that I wanted to see if I'm correct:
Affected Areas:
- Motor RPMs
- Cadence
- Top Speed
- Climbing Ability/ratio
- Motor Efficiency
- Motor Power Draw
- # of teeth engagement
- Wear/Maintenance

So I built a 29er SS currently with a lekkie 42t/20t but I have 38t-36t narrow wides along with a bunch of 20t/18t/16t rear but trying to figure out, at a equal "ratio" what would be better for a mid drive?

44t/22t:
- Higher top speed
- Lower Cadence
- Lower Motor RPM - More heat
- Less efficiency
- ***More power draw? I'm not sure on this one yet cause the initial at stop draw might be higher
- Climbing should be the same, just less cadence
- Less efficiency overall?
- More teeth engagement so less/no slippage and slightly more power transfer?
- Less maintenance cause less torque and more teeth to wear on

32t/16t:
- Less Top speed
- Higher Cadence
- Higher Motor RPM - Less Heat!
- More Efficient cause more spinning
- Less Power draw? But I think the initial at stop might be more
- Less teeth engagement
- More maintenance

So I know I can't have everything, but this is mainly a city cruiser/some slight hills but what sizing would you go with if it was you? I think a 25mph top speed is fine for this bike.

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ferret   1 kW

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Re: Pros/Cons of a 44t/22t vs 32t/16t on a mid drive?

Post by ferret » May 03 2019 12:27pm

Both 44t/22t and 32t/16t give you the same 2:1 gear ratio.

From the issues you mentioned only the teeth engagement and maybe the Wear/Maintenance will be different.

Avner.
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Tommm   10 kW

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Re: Pros/Cons of a 44t/22t vs 32t/16t on a mid drive?

Post by Tommm » May 03 2019 12:56pm

Bigger cogs with same ratio. Less frequent replacement of chain and cogs. That's the reason I went with 30/50t instead of 24/40t

markz   100 GW

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Re: Pros/Cons of a 44t/22t vs 32t/16t on a mid drive?

Post by markz » May 03 2019 8:11pm

All depends on your riding, and what your rear freewheel/cassette is.
For more speed then climbing, then a large front gear, like a 52 to an 11 rear, but if you want hill climbing then a 22 front to whatever rear you want, spend big bucks on a 36T+ or keep it reasonable with a 11-34T rear. What is the balance you want to achieve. Cruising speeds vs hill climbing speeds, and the amount of time your doing each.

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tomjasz   10 GW

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Re: Pros/Cons of a 44t/22t vs 32t/16t on a mid drive?

Post by tomjasz » May 03 2019 9:11pm

Any front sprocket under 42t, like the lekkie or Luna, will significantly change your chain land and likely you’ll lose a few gears.
Thanks Justin_le we're here thanks to you. All the best to the mods for their tireless work keeping it on an even keel.

markz   100 GW

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Re: Pros/Cons of a 44t/22t vs 32t/16t on a mid drive?

Post by markz » May 04 2019 4:44pm

There is another aspect to look at, which I am currently doing today.

What kind of parts do you have, I always keep my gears when throwing out a bad crank, which I have two. A new Tourney crank is fixed, no bolts to remove gears. Even with Square Taper there are two types of square taper when it comes to crank sets. One is square, the other is diamond. Put a square on and a diamond, your pedals are now at 100 and 180 degree angles. Then there is the BCD, my old crank had an older bcd, but the new ones can be 4 arms or 5 arms. Parts are good to have, I keep tote boxes full of parts. Time to buy some cheap bicycles and stock up on parts :lol: theres always el-cheapo bikes around.

No need to spend big bucks on new components like cranks or crank gears. As electrics we hardly pedal, if at all, anyways.

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