I run a 52t Lekkie Ring on a Bafang BBSHD but that is the largest chain ring Lekkie makes. There are higher tooth count chain rings advertised for the BBHSD but I've tried a few and they can't seem to get the offset correct. Is anyone actually running a chain ring higher than 52t on a BBHSD? If so I'd like to hear the details.
Highest tooth count for BBSHD chain ring?
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Matze_Senpai
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me personally i just run 42t because i want good chainline and i use mtb for light trails and commuting, top speed of 55kph is enough for me. biggest chainring ive seen is 52t i think, maybe you can get a bigger one with a chainring adapter
I have and the offset is way too far off hence this post.
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Chalo
100 TW
Yeah, the problem with spider adapters for BBSxx drives is that conventional chainring geometry precludes having the required bowl shape to place sprocket teeth in the same plane as the output gearbox.
The only relatively easy workaround I can think of would be to use a correctly offset chainring (Bafang, Lekkie, Luna) as a mounting surface for a larger chainring that has had interfering sections in its center removed.
Considering this would substantially diminish your motor's pull force on the chain, the only real advantage I can think of would be to allow you to run in larger, smoother, less wear-prone gears on the cassette. 52/11 is a huge gear ratio for full sized wheels and there's nothing to be gained by going up from there. However 66/14 is about the same ratio, and it's much gentler on the chain and sprockets.
The only relatively easy workaround I can think of would be to use a correctly offset chainring (Bafang, Lekkie, Luna) as a mounting surface for a larger chainring that has had interfering sections in its center removed.
Considering this would substantially diminish your motor's pull force on the chain, the only real advantage I can think of would be to allow you to run in larger, smoother, less wear-prone gears on the cassette. 52/11 is a huge gear ratio for full sized wheels and there's nothing to be gained by going up from there. However 66/14 is about the same ratio, and it's much gentler on the chain and sprockets.
Since I run a Shimano freewheel I am limited to 14t. I'm a country cruiser and would like to lower my cadence and up my speed a bit with a larger chainring pushing me to use lower gearing also.
...and now you have me thinking (although probably more effort than I'm willing to put into it at this point).
Chalo
100 TW
If there's nothing special about your rear wheel, that might be an easier place to start raising your ratio. 11-34 seven speed is a very common and cheap cassette that would work with your current shifting parts.
With the BBSHD I wear out the 14t way too much the way it is. I change freewheels just about every summer (1,500 miles or so) even though I lubricate the chain (dry) every 100 miles or so. The 11t would be much worse I would imagine. I'd like to run on a higher tooth gear in the rear to spread the wear a bit more.
Chalo
100 TW
Yeah, I wasn't happy with my chain and sprocket wear when I used BBS02. I settled on a custom 16-40t cassette stack and 42t chainring, with short 152mm cranks so I could spin them up to high RPM more easily.
But ultimately I switched back to hub motors and now I rarely wear anything out, despite pedaling along whenever I engage the motor. 60/16t is the top gear on my primary commuter bike, with 56/14t and 44/12t on my others.
Guerney
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I used to keep track of chain, chainwheel and sprocket wear on my BBS01B conversion, but they're all so cheap for my bike I stopped. On my small folding bike, 52T>11T = 94.54545455 gear inches, which isn't enough for the younger me, who would certainly have tried to install a 60T or larger chainwheel immediately for a bit more speed =
109.0909091 gear inches. I have been tempted by 60T chainwheels with inner offset on Amazon, but forced myself to look away from such foolishness. A claimed 8mm offset in total, if I recall correctly was possible. But the chainwheel looked a bit thin and flimsy, didn't look like it'd last more than 5 minutes at 36V X 20A = 720W, and worse the bundled adapter was carbon fiber.
109.0909091 gear inches. I have been tempted by 60T chainwheels with inner offset on Amazon, but forced myself to look away from such foolishness. A claimed 8mm offset in total, if I recall correctly was possible. But the chainwheel looked a bit thin and flimsy, didn't look like it'd last more than 5 minutes at 36V X 20A = 720W, and worse the bundled adapter was carbon fiber.
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Agreed! Just a hassle to have to replace and when they start skipping it's a PIA until replacement.
Guerney
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A lot of Googling might yield a more useful result on your side of the pond?
Wow! Never seen an 11t freewheel. Interesting! Regardless, I wear them out too often and am trying to increase the chain ring size.
I'm running a 52t from Aliexpress, they don't have any offset indeed, but I don't need it on my setup.
They go larger, but I never really had the need for larger.
So I run the 52t with KMC e8 chain and Shimano HG 11 - 34, I replace my chain and cassette at around 5000km, as preventive maintenance, but I might be able to get even more mileage out of them, the 52t don't need much replacement.
This is on a BBSHD with custom firmware, I'm a delivery rider, so it gets abused and ridden hard.
They go larger, but I never really had the need for larger.
So I run the 52t with KMC e8 chain and Shimano HG 11 - 34, I replace my chain and cassette at around 5000km, as preventive maintenance, but I might be able to get even more mileage out of them, the 52t don't need much replacement.
This is on a BBSHD with custom firmware, I'm a delivery rider, so it gets abused and ridden hard.
hillslayer@
100 W
Running a 60t on most bike's with offset the chainstay will be in the way.
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Hmmmm.... The chainstay wouldn't be a problem but I see what you mean. I've cracked a couple of Leckkie Rings when in first gear pulling hard so I'd like to go back to a steel ring with lower cadence but need to maintain or improve offset. (Pics are old 5-speed freewheel. Current 6-speed freewheel doesn't change much.)
I'd have to go out and check my parts shelf again because I think I have almost the same ring you're running. Can't remember if the adapter hit the housing or what it was, but I couldn't make it workable. Links to the one you are running?
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hillslayer@
100 W
The bike in my picture has an extension to fit a battery in the frame which takes the chainstay out of being an issue. I was able to get a 60t on a BBSO2 on a 29er mountain bike frame but chainline on a BBSHD is more problematic on most bike's.
hillslayer@
100 W
How many spacers are using to move the motor away from the frame.
None I think. (Been awhile since I've been in there.) I run as far shifted to the left as I can since I cracked the first ring.
hillslayer@
100 W
Your chainline looks like you need the expensive offset chainrings. Changing the frame might be best. Was pedaling at 35 mph today on 14t cog and hub motor was still pulling 1200 watts with a low battery not sure how much more the 1500 watt hub has left on 48 volts.
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