Can't find 5-bolt, 428h rear sprocket to save my life ;,-(

Psomniferum · 03-15-2020, 06:07 AM

My stupid Venom X22/125 has CBR250-sized rims, only they're 5-bolt instead of 4x. My stock gearing ran 14/41 and I was topping out @63mph @ 9k rpm. The 150cc I bought has a 15t on it, which is what I wanted to start out with. But I cannot find a replacement for the rear! I was hoping to try a 15/39 combo to start off with.I found a Thunpstar 43t on TBolt, but that's going the wrong way. I was hoping to find a 38 or 39t. Hell! I'd be happy with a 40t, just to know I have variety! How hard would it be to switch to 4-bolt? I've never torn into a bike wheel before. Can I switch the hub out? Do I have to replace the whole rim? I was tempted to swap out to CBR250 rims anyways, for the better brakes. This might bring me one step closer if I can't find a rear sprocket.

Psomniferum · 03-15-2020, 06:16 AM

PS- will CBR250 rims even fit? I'm wondering if the axles are going to line up. If the brake lines and hardware are goung to clear the forks and swing arms, etc... I guess I'll have to go to the junkyard and find a set. Only way I'll ever find out...

franque · 03-15-2020, 07:16 AM

Send an email to jt sprockets with all of the dimensions. If it's used somewhere else, they can find it for you.

**JerryHawk250** · 03-15-2020, 07:36 AM

You will have to get one custom made. 35 tooth will be the smallest that will fit. I ordered one from here.
https://shop.pbisprockets.com/product.sc?productId=503

**JerryHawk250** · 03-15-2020, 07:43 AM

Quote:

Originally Posted by franque

Send an email to jt sprockets with all of the dimensions. If it's used somewhere else, they can find it for you.

The JTR242 has the same specs but only comes in a 50 and 53 tooth.

**JerryHawk250** · 03-15-2020, 08:22 AM

Why not just change the front sprocket to a 16 or 17 tooth? Should be easier to find.

Psomniferum · 03-15-2020, 10:44 AM

Thanks franque and Jerry! I'm already on PBI filling out the forms. This is AWESOME! By the way, Jerry, the engine already has a 15 on it, I plan on buying both 16 and 17. I wanted to start with a taller base out back since I was shorter than anyone else I had seen! I think I'll have more flexibility if I can switch out both sides. Do you have the 5-bolt CBR250-sized rims on your X22/250 as well?

**JerryHawk250** · 03-15-2020, 01:26 PM

Both biked use the same rear sprocket.

03-15-2020, 06:07 AM	#1
Psomniferum Join Date: Jan 2020 Location: California Posts: 75	Can't find 5-bolt, 428h rear sprocket to save my life ;,-( My stupid Venom X22/125 has CBR250-sized rims, only they're 5-bolt instead of 4x. My stock gearing ran 14/41 and I was topping out @63mph @ 9k rpm. The 150cc I bought has a 15t on it, which is what I wanted to start out with. But I cannot find a replacement for the rear! I was hoping to try a 15/39 combo to start off with.I found a Thunpstar 43t on TBolt, but that's going the wrong way. I was hoping to find a 38 or 39t. Hell! I'd be happy with a 40t, just to know I have variety! How hard would it be to switch to 4-bolt? I've never torn into a bike wheel before. Can I switch the hub out? Do I have to replace the whole rim? I was tempted to swap out to CBR250 rims anyways, for the better brakes. This might bring me one step closer if I can't find a rear sprocket. __________________ 2018 Venom x22/125cc (Baodiao 125-11) Lifan 150cc w/TB V2 roller-rocker head, Mikuni vm26 carb, and FMF muffler
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03-15-2020, 06:16 AM	#2
Psomniferum Join Date: Jan 2020 Location: California Posts: 75	PS- will CBR250 rims even fit? I'm wondering if the axles are going to line up. If the brake lines and hardware are goung to clear the forks and swing arms, etc... I guess I'll have to go to the junkyard and find a set. Only way I'll ever find out... __________________ 2018 Venom x22/125cc (Baodiao 125-11) Lifan 150cc w/TB V2 roller-rocker head, Mikuni vm26 carb, and FMF muffler
	0

03-15-2020, 07:36 AM	#4
JerryHawk250 Moderator Join Date: Oct 2016 Location: Houma, La. Posts: 11,589	You will have to get one custom made. 35 tooth will be the smallest that will fit. I ordered one from here. https://shop.pbisprockets.com/product.sc?productId=503 __________________ 2023 Lifan Lycan 250 Chopper 2023 Venom Evader 2022 Lifan KPX250 2020 Kawasaki Vulcan S (Sold) 2004 Honda ST 1300 2016 Black Hawk 250 (sold) Keihin PE30 carb,125 main,38 slow.Pod filter,ported & decked head 10:1 CR,Direct Ignition Coil,15/40Sprockets,NGK DPR8EIX-9,De-Cat,Dual Oil Cooler,Digital Cluster 2016 Cazador180 XL 2014 Coolster150 JerryHawk250.com My YouTube Channel
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03-15-2020, 08:22 AM	#6
JerryHawk250 Moderator Join Date: Oct 2016 Location: Houma, La. Posts: 11,589	Why not just change the front sprocket to a 16 or 17 tooth? Should be easier to find. __________________ 2023 Lifan Lycan 250 Chopper 2023 Venom Evader 2022 Lifan KPX250 2020 Kawasaki Vulcan S (Sold) 2004 Honda ST 1300 2016 Black Hawk 250 (sold) Keihin PE30 carb,125 main,38 slow.Pod filter,ported & decked head 10:1 CR,Direct Ignition Coil,15/40Sprockets,NGK DPR8EIX-9,De-Cat,Dual Oil Cooler,Digital Cluster 2016 Cazador180 XL 2014 Coolster150 JerryHawk250.com My YouTube Channel
	0

03-15-2020, 10:44 AM	#7
Psomniferum Join Date: Jan 2020 Location: California Posts: 75	Thanks franque and Jerry! I'm already on PBI filling out the forms. This is AWESOME! By the way, Jerry, the engine already has a 15 on it, I plan on buying both 16 and 17. I wanted to start with a taller base out back since I was shorter than anyone else I had seen! I think I'll have more flexibility if I can switch out both sides. Do you have the 5-bolt CBR250-sized rims on your X22/250 as well? __________________ 2018 Venom x22/125cc (Baodiao 125-11) Lifan 150cc w/TB V2 roller-rocker head, Mikuni vm26 carb, and FMF muffler
	0

03-15-2020, 07:16 AM	#3
franque Join Date: Nov 2017 Location: Marseille, France -> Conakry, Guinea Posts: 1,481	Send an email to jt sprockets with all of the dimensions. If it's used somewhere else, they can find it for you.
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03-15-2020, 01:26 PM	#8
JerryHawk250 Moderator Join Date: Oct 2016 Location: Houma, La. Posts: 11,589	Both biked use the same rear sprocket. __________________ 2023 Lifan Lycan 250 Chopper 2023 Venom Evader 2022 Lifan KPX250 2020 Kawasaki Vulcan S (Sold) 2004 Honda ST 1300 2016 Black Hawk 250 (sold) Keihin PE30 carb,125 main,38 slow.Pod filter,ported & decked head 10:1 CR,Direct Ignition Coil,15/40Sprockets,NGK DPR8EIX-9,De-Cat,Dual Oil Cooler,Digital Cluster 2016 Cazador180 XL 2014 Coolster150 JerryHawk250.com My YouTube Channel
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