Asymetrical Rear Dropouts On Vintage Road Bike: Normal?
06-17-15, 07:04 PM
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Asymetrical Rear Dropouts On Vintage Road Bike: Normal?
I bought a road bike a few weeks ago and am in the process of converting it to single speed with coaster brakes. I am replacing everything besides the frame and will have a few questions about bottom bracket sizing/pairing, but this issue needs to be handled before I can go any further.
The non-drive side rear dropout bends inwards towards the center of the frame.
Measured with calipers the distance between the dropouts is 123.8mm.
This feels like an odd measurement, and if I were to bend the dropout to match the straighter drive side it would measure to around 127mm.
Before I go and try "fixing" the bend, I was wondering if it's possible that the bend is supposed to be there?
There doesn't appear to be any stress marks or indications that it was bent from use/abuse, but I feel that it was.
The bike is a ~70's Bridgestone Regulus, I haven't been able to find much info on this model.
This is also my first real bike and project, it's been fun so far and I've gained tons of knowledge from these forums, so thanks!
Tried taking some photos but the bend was indistinguishable.
The non-drive side rear dropout bends inwards towards the center of the frame.
Measured with calipers the distance between the dropouts is 123.8mm.
This feels like an odd measurement, and if I were to bend the dropout to match the straighter drive side it would measure to around 127mm.
Before I go and try "fixing" the bend, I was wondering if it's possible that the bend is supposed to be there?
There doesn't appear to be any stress marks or indications that it was bent from use/abuse, but I feel that it was.
The bike is a ~70's Bridgestone Regulus, I haven't been able to find much info on this model.
This is also my first real bike and project, it's been fun so far and I've gained tons of knowledge from these forums, so thanks!
Tried taking some photos but the bend was indistinguishable.
Last edited by Hellhunde; 06-17-15 at 07:40 PM.
06-17-15, 08:34 PM
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Are the dropout faces parallel? This can be checked with the Campagnolo "H" tool or equivalent:
Is the midpoint between the dropouts co-planar with the centerline of the frame? This can be checked with the Park ***-1 or "string test:"
Bicycle Frame/Hub Spacing
Is the midpoint between the dropouts co-planar with the centerline of the frame? This can be checked with the Park ***-1 or "string test:"
Bicycle Frame/Hub Spacing
06-17-15, 09:10 PM
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....
The non-drive side rear dropout bends inwards towards the center of the frame.
Measured with calipers the distance between the dropouts is 123.8mm.
This feels like an odd measurement, and if I were to bend the dropout to match the straighter drive side it would measure to around 127mm.
....
The non-drive side rear dropout bends inwards towards the center of the frame.
Measured with calipers the distance between the dropouts is 123.8mm.
This feels like an odd measurement, and if I were to bend the dropout to match the straighter drive side it would measure to around 127mm.
....
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An ounce of diagnosis is worth a pound of cure.
“Never argue with an idiot. He will only bring you down to his level and beat you with experience.”, George Carlin
“One accurate measurement is worth a thousand expert opinions” - Adm Grace Murray Hopper - USN
WARNING, I'm from New York. Thin skinned people should maintain safe distance.
FB
Chain-L site
An ounce of diagnosis is worth a pound of cure.
“Never argue with an idiot. He will only bring you down to his level and beat you with experience.”, George Carlin
“One accurate measurement is worth a thousand expert opinions” - Adm Grace Murray Hopper - USN
WARNING, I'm from New York. Thin skinned people should maintain safe distance.
06-18-15, 12:38 AM
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Just as I thought, but you can never be too sure.
Really appreciate the replies, I've got the dropouts aligned and will do the string test tomorrow.
Really appreciate the replies, I've got the dropouts aligned and will do the string test tomorrow.
