CAAD8 2300 frame won't take 10 speed cassette

[TheJDog]

Hi

I recently bought a cheap (ish) CAAD8 with Shimano 2300 8-speed components as a cheap replacement for my stolen fancy bike. I rebuilt it with some SRAM stuff I had just lying around :S

Unfortunately, the rear seat stay now runs incredibly close to the last cog of the cassette. So close that if the change 9-10 or 10-9 bumps in any way, I get a chain jammed between the cassette and the chainstay. With the chain on the cog, there is a gap of less than a mm between frame and chain.

Are all frames droputs standard width? Shouldn't the 8th cog of an 8 speed cassette be in the same position as the 10th cog of a 10-speed? Is this frame a bit weird?

I don't think I have a spacer in the cassette, but now that I type this post it seems like that should be my first port of call.

It's actually not a huge problem, because in real life, I don't think I ever use top gear. I did some 50mph descending on Saturday, and wasn't anywhere near top gear, so maybe I should just stop worrying about it..

Jasper

 

[HLaB]

No idea but if I was to start looking into it I'd check out Sheldon http://sheldonbrown.com/frame-spacing.html

 

[eck]

I had a similar issue with an old Airborne ti frame: cured it by putting a bog standard washer inboard of the drop-out. It made just enough room for the chain on the smallest sprocket. Might be worth a try?

 

[Roadrider48]

My bike was an 8 speed until I upgraded to a 105-10speed cassette. It works fine without the need for any spacers. I also upgraded the chain, rear mech, front mech, shifters and brakes. All to 105 standard.
But the gap between the dropouts wasn't an issue.

 

[raleighnut]

Hi

I recently bought a cheap (ish) CAAD8 with Shimano 2300 8-speed components as a cheap replacement for my stolen fancy bike. I rebuilt it with some SRAM stuff I had just lying around :S

Unfortunately, the rear seat stay now runs incredibly close to the last cog of the cassette. So close that if the change 9-10 or 10-9 bumps in any way, I get a chain jammed between the cassette and the chainstay. With the chain on the cog, there is a gap of less than a mm between frame and chain.

Are all frames droputs standard width? Shouldn't the 8th cog of an 8 speed cassette be in the same position as the 10th cog of a 10-speed? Is this frame a bit weird?

I don't think I have a spacer in the cassette, but now that I type this post it seems like that should be my first port of call.

It's actually not a huge problem, because in real life, I don't think I ever use top gear. I did some 50mph descending on Saturday, and wasn't anywhere near top gear, so maybe I should just stop worrying about it..

Jasper

Use a ten speed specific rear hub.
Or a washer

 

[TheJDog]

Use a ten speed specific rear hub.
Or a washer

Yeah, the wheel is 10 speed. Which is why it seemed strange. Though are 10 speed hubs and 8 speed hubs the same width? I assumed they would be. Yes, Sheldon says they are, all 130mm

 

[raleighnut]

Yeah, the wheel is 10 speed. Which is why it seemed strange. Though are 10 speed hubs and 8 speed hubs the same width? I assumed they would be. Yes, Sheldon says they are, all 130mm

Its not the width that's the problem its the offset on the spacers drive to non drive side

 

[TheJDog]

I'll measure the wheel and cassette that came off to see where its top gear sits relative to the axle...

 

[RecordAceFromNew]

Shouldn't the 8th cog of an 8 speed cassette be in the same position as the 10th cog of a 10-speed?

This is the critical question. The distance between the inside surface of the drive side dropout and the outside face of the smallest sprocket should be c5mm for 8 speed, 4.5mm for Shimano 10 and 4mm for Campag 10. Given a 10 speed chain is only c6.2mm wide you should not run out of clearance, but on the other hand it is tight and there is little room for error. A not uncommon error, e.g., is wrong spacer used on the cassette for the wheel, given the correct choice can be a bit of a minefield.

 

[ColinJ]

How many teeth on your smallest sprocket? (I'm thinking that a 12 might be ok, but a 13 isn't? Or perhaps an 11 would be ok, but a 12 isn't?)

 

[Cyclist33]

This is the critical question. The distance between the inside surface of the drive side dropout and the outside face of the smallest sprocket should be c5mm for 8 speed, 4.5mm for Shimano 10 and 4mm for Campag 10. Given a 10 speed chain is only c6.2mm wide you should not run out of clearance, but on the other hand it is tight and there is little room for error. A not uncommon error, e.g., is wrong spacer used on the cassette for the wheel, given the correct choice can be a bit of a minefield.

and just to throw another spanner in, the table in that link doesnt cover the spacer/hub setup that ive got correctly.

 

[RecordAceFromNew]

and just to throw another spanner in, the table in that link doesnt cover the spacer/hub setup that ive got correctly.

Really? What setup do you have and what spacer do you need instead?

 

[Cyclist33]

I have 11 speed freehubs and 9 speed cassettes and one of them takes a 1.85mm spacer behind the cassette and the other a 1mm spacer in front!

 

[400bhp]

I have 10 speed on CAAD9 with no issues?

I think @potsy has 10 speed on his CAAD8?

 

[potsy]

I have 10 speed on CAAD9 with no issues?

I think @potsy has 10 speed on his CAAD8?

Yes 10 speed here on a Caad 8, wonder if it would be worth twiddling the rear mech stop to make sure you can't go into the last cog?
If you don't really use it anyway, just a thought.

Does sound like a spacer issue though, what cassette are you running?