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Dimple chainstays first?

Old 12-12-20, 04:40 PM
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unterhausen
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Dimple chainstays first?

I have some un-dimpled chainstays and I am going to use a pair for a stupid project (trainer bike, but that's not the stupid part). It doesn't actually need dimpled chainstays, but I figure if I leave them un-dimpled I'm going to regret it.
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Old 12-13-20, 03:47 AM
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Originally Posted by unterhausen View Post
I have some un-dimpled chainstays and I am going to use a pair for a stupid project (trainer bike, but that's not the stupid part). It doesn't actually need dimpled chainstays, but I figure if I leave them un-dimpled I'm going to regret it.
One good thing about chainstay indents is it's much easier to make more clearance later. The indenting tool has the existing crease to settle into, so it doesn't want to wander off. I just did that on a 700c frame being converted to 650b. After increasing the existing dents, I am able to fit a 48 mm tire in there now. It was 32 mm max in 700c and before increasing the indenting. I was hoping for 42 mm or larger in 650b, so going all the way to 48 mm is just gravy.

Just be careful (I know you will) to orient those indents correctly before you lock in the angle they're clocked to, say by brazing them to the dropout.

That's not a warning I would've thought I'd need to give anybody, but I was just given this crashed frame (pic below) for free. I thought I might replace the TT & DT because it's a famous brand (no, not saying who) in a rare small size that might be useful for someone, but now that I've seen this gaffe on the right chainstay, I will probably just toss the frame.



Sorry about the terrible photo, shoulda wiped the durt off it first at least, but can you see how the right side indent is clocked low?
The indent on the outside is clocked high too, same amount, so I think the indenting was done first, then the slot for the Campy dropout was made without regard for the placement of the indents. Oops.

Mark B in Seattle
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Old 12-13-20, 07:09 AM
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I've never regretted having "too much" tire clearance.
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Old 12-13-20, 07:58 AM
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No tire on my trainer

The chainstays are fully round. Deda cheapest tubing I bought for practice. I think BITD that I only made one bike with round chainstays and my technique of denting them probably isn't a good idea. I drove a cylinder into the finished frame. People say that causes cracks, and I believe them.

Around here, bikes like the one in your pic are being turned into bike racks right now. The rear triangle is the part that keeps bikes upright. It's like cannibalism
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