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30x17 chainstays questions

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30x17 chainstays questions

Old 08-17-15, 03:39 PM
  #1  
bill meyer
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30x17 chainstays questions

I'm planning to build a Cross frame and have run into a issue with the chainstays. I want to use this pacenti BB I have with 30x17 sockets, but the only stays I see in that size are generally S bend. My BB has a 7.5 degree offset, but when I fit these CS's as you can see we're nowhere close to the proper spacing in the back. It seems I need straight CS's, but I can't find those anywhere in the 30x17 size, only S bend. What am I missing here?
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Old 08-17-15, 04:39 PM
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busdriver1959
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Nova lists them as 24mm oval chainstays. They're straight stays. The individual descriptions on the ones I looked at described them as 30/16. I haven't used that BB shell but the 24mm ovals I have used fit fine in a few different BB shells.
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Old 08-17-15, 05:11 PM
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unterhausen
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I hate this issue. I have a small pile of chainstays that will only work on a fillet brazed bb because they are some weird size. Nova really needs to say if they fit a lugged bb shell in the description of the part. I know we could each ask indivdually
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Old 08-17-15, 07:38 PM
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bill meyer
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Well crap, guess I should've dug further, the 24mm straight on Nova are indeed 30x16. Thanks for that. Guess I have some extra stay's and an excuse to do some fillet brazing..
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Old 08-17-15, 10:32 PM
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unterhausen
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I misunderstood your picture. People build those into lugged frames. The issue is chain ring clearance once you bend out the sockets. If you can clear the chain rings, it's no problem. If you use discs, that introduces more constraints. I think for disc usage, you are going to want to use seat stay mounted calipers.

I think for this you're going to want to mock things up or make a full-size drawing
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Old 08-18-15, 07:01 AM
  #6  
Live Wire 
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Columbus stays have a shape that fit that BB nicely, they even have an S bend with better bends for a lugged shell.
that said, if the stays you have right now are a good shape for the shell, why not just bend them a little more to get the dropout spacing you want?
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Old 08-18-15, 08:18 AM
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bill meyer
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Originally Posted by Live Wire View Post
Columbus stays have a shape that fit that BB nicely, they even have an S bend with better bends for a lugged shell.
that said, if the stays you have right now are a good shape for the shell, why not just bend them a little more to get the dropout spacing you want?
I may end up bending them, I was just surprised how far off they are to start.

Are these the Columbus stays you are talking about? COLUMBUS LIFE 24mm ROAD S-BEND CX/ROAD :: S-BEND :: ROAD CHAINSTAYS :: CHAINSTAYS :: TUBES STEEL :: Nova Cycles Supply Inc.
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Old 08-18-15, 08:23 AM
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bill meyer
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Originally Posted by unterhausen View Post
I misunderstood your picture. People build those into lugged frames. The issue is chain ring clearance once you bend out the sockets. If you can clear the chain rings, it's no problem. If you use discs, that introduces more constraints. I think for disc usage, you are going to want to use seat stay mounted calipers.

I think for this you're going to want to mock things up or make a full-size drawing
Glad you mentioned chain ring clearance, I might have overlooked that. Going to run canti's on this, so no worries about disk stuff this time around..
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Old 08-18-15, 11:25 AM
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Looks like the Curved chainstays Pinarello used in the build of the CX frame I got in 1990, they Tigged them to the BB shell .

Seat stays have a similar gentle S bend, benefitting mud clearance (?)

before building maybe make a jig to bend them to be further apart at that last curve..

Last edited by fietsbob; 08-18-15 at 11:29 AM.
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Old 08-18-15, 12:43 PM
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Live Wire 
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Originally Posted by bill meyer View Post
I may end up bending them, I was just surprised how far off they are to start.

Are these the Columbus stays you are talking about? COLUMBUS LIFE 24mm ROAD S-BEND CX/ROAD :: S-BEND :: ROAD CHAINSTAYS :: CHAINSTAYS :: TUBES STEEL :: Nova Cycles Supply Inc.
No, the ones I'm talking about are LIFE (pretty sure) but have the regular profile to the taper. Joe B and Richard Sachs sell them.
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Old 03-23-16, 08:57 AM
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I'm sure it's too late now, but rather than bending out the lugs in the shell, why not increase the second bend in the stay to get the proper axle width?
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Old 03-23-16, 09:30 AM
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that's really hard on a heat treated stay. I tried, and failed. I was pretty sure I could get it to work, but I didn't want to go through $200 in stays in a learning curve. I was thinking about getting some of the Nova non-heat treated stays and bending those. And if you are going with low-mount discs, that second bend is the wrong way already

As far as bending the shell, I felt like I had plenty of clearance for the gears I wanted to put on there. If a builder wanted to ensure that anything up to a 42 inner chainring was going to fit, then it would be an issue

I recently exchanged emails with Lon at Nova about the way they label their chainstays. He said he would revisit the listings

Last edited by unterhausen; 03-23-16 at 04:13 PM.
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