Tao Tao ATA250-D rear sprocket - Page 2

Rule308 · 08-30-2015, 11:58 AM

anyone found a rear sprocket for ATA-250D bigger than 40 teeth?

Weldangrind · 08-30-2015, 12:35 PM

I've found that rear sprockets are tricky to find in different sizes. What size is your front sprocket?

Rule308 · 08-30-2015, 01:16 PM

Its a 428-12 front and I want higher than 40 rear to have a really low gearing and be able to creep slow (and quieter creeping) and without stalling. Looking to make it "granny". It will still be plenty fast for the area I'm in, just want as slow a crawler as possible.

Rule308 · 08-31-2015, 09:43 PM

http://shop.pbisprockets.com/product...&categoryId=56

Custom built blanks, drill your own holes.

Blank 428 Steel Rear Sprockets.
Blank Steel Rear Sprockets, available in 428, 520 and 530 chain sizes. With 1.0in. center hole. No lightening holes or bolt holes.
High Quality Carbon Steel - 45C:

They have 47 to 57 teeth options. I'm thinking I can use the old sprocket for the bolt pattern transfer to the new one. They sell aluminum or steel sprocket blanks.

They also have a custom build option to build to your bolt circle and center hole, but its always in 7075-T651 Aluminum. But the custom sprocket only comes to $50. Thats with 38mm center hole, 57mm bolt circle. And in my case I'm looking at going full on granny so maybe 50 tooth, but with option to go to 60 tooth max

Rule308 · 08-31-2015, 10:06 PM

Sprocket Diameter calculator online

https://www.rbracing-rsr.com/calcsprocketdiam.html

Chain length calculator

https://www.rbracing-rsr.com/chainlength.html

Weldangrind · 09-01-2015, 12:12 AM

I can't imagine that anything bigger that 50 would be useable.

Rule308 · 09-01-2015, 06:32 PM

Somehow I responded to the post higher up and it didn't post at the end of the string of posts. Drunk I guess. I found a place that makes sprockets for relatively cheap, but they make them custom in 7075 aluminum, but you can buy blanks in steel and drill you own holes. See about 5-8 posts up above.

In addition those calculators for the diameter and chain length will be handy.

I plan on ordering the largest sprocket that will fit with clearance in rear, and probably two more sizes spaced between that and 40 teeth to find the best for the terrain. Most of the area is absolutely full of prickly pear and finger cactus (I hate that $hit) and all sizes of boulders so you have to take it easy or your be rolling in it.

Rule308 · 09-01-2015, 08:49 PM

Using the sprocket calculator, it looks like about as big as you can fit on a 250D with the lower sprocket skid plate is probably around 46 teeth with a sprocket diameter of ~7.3" diameter. Thats about equivalent to going from a 12/40 to a 10/40 sprocket ratio (3-4 rear teeth per 1 front tooth). Assuming I go with a 12/46.

That's going from a 2.67 ratio to a 3.83 ratio, 43% higher.

08-30-2015, 12:35 PM	#17
Weldangrind Join Date: Mar 2009 Location: Sardis, BC, Canada Posts: 25,977	I've found that rear sprockets are tricky to find in different sizes. What size is your front sprocket? __________________ Weldangrind "I figure I'm well-prepared for coping with a bike that comes from the factory with unresolved issues and that rewards the self-reliant owner." - Buccaneer
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08-30-2015, 01:16 PM	#18
Rule308 Join Date: Aug 2015 Location: Houston but will ride in Llano Texas Posts: 52	12 front Its a 428-12 front and I want higher than 40 rear to have a really low gearing and be able to creep slow (and quieter creeping) and without stalling. Looking to make it "granny". It will still be plenty fast for the area I'm in, just want as slow a crawler as possible.
	0

08-31-2015, 09:43 PM	#19
Rule308 Join Date: Aug 2015 Location: Houston but will ride in Llano Texas Posts: 52	Hey Hey Hey, looky what I found! http://shop.pbisprockets.com/product...&categoryId=56 Custom built blanks, drill your own holes. Blank 428 Steel Rear Sprockets. Blank Steel Rear Sprockets, available in 428, 520 and 530 chain sizes. With 1.0in. center hole. No lightening holes or bolt holes. High Quality Carbon Steel - 45C: They have 47 to 57 teeth options. I'm thinking I can use the old sprocket for the bolt pattern transfer to the new one. They sell aluminum or steel sprocket blanks. They also have a custom build option to build to your bolt circle and center hole, but its always in 7075-T651 Aluminum. But the custom sprocket only comes to $50. Thats with 38mm center hole, 57mm bolt circle. And in my case I'm looking at going full on granny so maybe 50 tooth, but with option to go to 60 tooth max Last edited by Rule308; 08-31-2015 at 10:02 PM. Reason: more info found
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09-01-2015, 12:12 AM	#21
Weldangrind Join Date: Mar 2009 Location: Sardis, BC, Canada Posts: 25,977	I can't imagine that anything bigger that 50 would be useable. __________________ Weldangrind "I figure I'm well-prepared for coping with a bike that comes from the factory with unresolved issues and that rewards the self-reliant owner." - Buccaneer
	0

09-01-2015, 06:32 PM	#22
Rule308 Join Date: Aug 2015 Location: Houston but will ride in Llano Texas Posts: 52	I'll let you know how it is Somehow I responded to the post higher up and it didn't post at the end of the string of posts. Drunk I guess. I found a place that makes sprockets for relatively cheap, but they make them custom in 7075 aluminum, but you can buy blanks in steel and drill you own holes. See about 5-8 posts up above. In addition those calculators for the diameter and chain length will be handy. I plan on ordering the largest sprocket that will fit with clearance in rear, and probably two more sizes spaced between that and 40 teeth to find the best for the terrain. Most of the area is absolutely full of prickly pear and finger cactus (I hate that $hit) and all sizes of boulders so you have to take it easy or your be rolling in it.
	0

08-30-2015, 11:58 AM	#16
Rule308 Join Date: Aug 2015 Location: Houston but will ride in Llano Texas Posts: 52	anyone found a rear sprocket for ATA-250D bigger than 40 teeth?
	0

08-31-2015, 10:06 PM	#20
Rule308 Join Date: Aug 2015 Location: Houston but will ride in Llano Texas Posts: 52	Sprocket Diameter calculator online https://www.rbracing-rsr.com/calcsprocketdiam.html Chain length calculator https://www.rbracing-rsr.com/chainlength.html
	0

09-01-2015, 08:49 PM	#23
Rule308 Join Date: Aug 2015 Location: Houston but will ride in Llano Texas Posts: 52	Using the sprocket calculator, it looks like about as big as you can fit on a 250D with the lower sprocket skid plate is probably around 46 teeth with a sprocket diameter of ~7.3" diameter. Thats about equivalent to going from a 12/40 to a 10/40 sprocket ratio (3-4 rear teeth per 1 front tooth). Assuming I go with a 12/46. That's going from a 2.67 ratio to a 3.83 ratio, 43% higher.
	0