Gio X31 Rear Sprocket Replacement, suggestion??

astortts · 03-03-2011, 07:39 PM

I am looking for a 428 chain, 49 tooth sprocket, with enough material in the center to machine new holes, because the rear sprocket has bolt holes that are 68mm center to center, with a cut out of approx. 53mm.

Any ideas. I have access to some machines but I cannot machine a custom sprocket.

astortts · 03-03-2011, 08:20 PM

Answered own question, DS80 1982-2003.

Jim · 03-03-2011, 10:22 PM

Glad to hear you got it figured out

Weldangrind · 03-04-2011, 12:52 AM

I don't think I understand. Is it that you're trying to fit a 49 tooth, but you couldn't find a direct fit?

Jim · 03-04-2011, 03:04 AM

I think he found a sprocket off a 82-03 DS80 that is a direct fit?

astortts · 03-04-2011, 08:37 AM

That's correct a 79-2003 ds80 sprocket is almost a direct fit, the center section needs approx. 2mm machined out. Lots of options, i think like 35-50 teeth.

Weldangrind · 03-04-2011, 10:16 AM

Sorry, I'm still stuck on the machining point. Do you mean that you can't find an exact fit replacement sprocket for your Gio?

astortts · 03-04-2011, 10:45 AM

Ok, let me start from square one. The ratio for that stock gio 2007 x31 19/16 was 15 front, 48 rear. Or 3.2, for an mx bike the ratio should be between 3.5 to 5. So what I want is some tunability for my gearing.

I went to a 14 Front, and now I want a 49 tooth rear or even a 50 rear, that puts me at a 3.5 to 3.57 respectively. The stock rear available from gio is only 48 teeth.

Catch my drift. I am not racing anybody so I don't really care if I lose some top end, but it will make japanese riders wonder whats happening.

Weldangrind · 03-04-2011, 10:48 AM

I get that you want to play with ratios; I've done plenty of that. I'm just surprised that you can't find a direct fit replacement sprocket that doesn't need modification.

03-03-2011, 07:39 PM	#1
astortts Join Date: Feb 2011 Location: Nova Scotia Posts: 27	Gio X31 Rear Sprocket Replacement, suggestion?? I am looking for a 428 chain, 49 tooth sprocket, with enough material in the center to machine new holes, because the rear sprocket has bolt holes that are 68mm center to center, with a cut out of approx. 53mm. Any ideas. I have access to some machines but I cannot machine a custom sprocket.
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03-03-2011, 10:22 PM	#3
Jim Join Date: Mar 2007 Location: Abbotsford, BC, Canada Posts: 4,880	Glad to hear you got it figured out __________________ "Be excellent to each other" "We are all human. Let's start to prove it!"
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03-04-2011, 12:52 AM	#4
Weldangrind Join Date: Mar 2009 Location: Sardis, BC, Canada Posts: 25,977	I don't think I understand. Is it that you're trying to fit a 49 tooth, but you couldn't find a direct fit? __________________ 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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03-04-2011, 03:04 AM	#5
Jim Join Date: Mar 2007 Location: Abbotsford, BC, Canada Posts: 4,880	I think he found a sprocket off a 82-03 DS80 that is a direct fit? __________________ "Be excellent to each other" "We are all human. Let's start to prove it!"
	0

03-04-2011, 10:16 AM	#7
Weldangrind Join Date: Mar 2009 Location: Sardis, BC, Canada Posts: 25,977	Sorry, I'm still stuck on the machining point. Do you mean that you can't find an exact fit replacement sprocket for your Gio? __________________ 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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03-03-2011, 08:20 PM	#2
astortts Join Date: Feb 2011 Location: Nova Scotia Posts: 27	Answered own question, DS80 1982-2003.
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03-04-2011, 08:37 AM	#6
astortts Join Date: Feb 2011 Location: Nova Scotia Posts: 27	That's correct a 79-2003 ds80 sprocket is almost a direct fit, the center section needs approx. 2mm machined out. Lots of options, i think like 35-50 teeth.
	0

03-04-2011, 10:45 AM	#8
astortts Join Date: Feb 2011 Location: Nova Scotia Posts: 27	Ok, let me start from square one. The ratio for that stock gio 2007 x31 19/16 was 15 front, 48 rear. Or 3.2, for an mx bike the ratio should be between 3.5 to 5. So what I want is some tunability for my gearing. I went to a 14 Front, and now I want a 49 tooth rear or even a 50 rear, that puts me at a 3.5 to 3.57 respectively. The stock rear available from gio is only 48 teeth. Catch my drift. I am not racing anybody so I don't really care if I lose some top end, but it will make japanese riders wonder whats happening.
	0

03-04-2011, 10:48 AM	#9
Weldangrind Join Date: Mar 2009 Location: Sardis, BC, Canada Posts: 25,977	I get that you want to play with ratios; I've done plenty of that. I'm just surprised that you can't find a direct fit replacement sprocket that doesn't need modification. __________________ 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