Searching for a 30mm seatpost clamp w/parallel clamping surfaces
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Searching for a 30mm seatpost clamp w/parallel clamping surfaces
I've been searching for a 30mm seatpost clamp, with parallel clamping surfaces, and preferably no threads (pic below). If it has threads, that's probably okay as I can drill them out. I can't find one anywhere! I've spent time online and asked three LBS -- none found.
I'll be using it with a Pitlock locking seatpost clamp skewer. Pitlock sells such a seatclamp, but not in 30mm.
If somebody can point me to one, I'd sure appreciate it. Thanks.
I'll be using it with a Pitlock locking seatpost clamp skewer. Pitlock sells such a seatclamp, but not in 30mm.
If somebody can point me to one, I'd sure appreciate it. Thanks.
Last edited by Blue Roads; 10-18-08 at 11:16 AM.
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I bought the 30mm GT seatpost clamp, but the new design does not have parallel clamping surfaces -- in fact, not even close.
I also bought the Surly Constrictor seatpost clamp. It looked like it might work, but it also doesn't have enough parallel clamping surface to properly work.
If somebody can point me to 30mm seatpost clamp with parallel (outer) clamping surfaces, I'd sure appreciate it. Thanks.
I also bought the Surly Constrictor seatpost clamp. It looked like it might work, but it also doesn't have enough parallel clamping surface to properly work.
If somebody can point me to 30mm seatpost clamp with parallel (outer) clamping surfaces, I'd sure appreciate it. Thanks.
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Maybe it'd be easier to get a larger one and shim? Or smaller and enlarge it?
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I asked my LBS about it today. I've got the 28.6mm and 31.8mm clamps that Pitlock makes, but the LBS said they are unaware of a shim that goes from 31.8mm to 30mm. Last week, a different LBS tried to spread the 28.6mm and ease it onto the seatpost tube, but it wouldn't fit.
I believe 30mm is an uncommon clamp size for aluminum or carbon frame bikes, but a common size for a steel frame bike. This is for a steel frame.
My search continues.
Edited to add: I want to add that I have front and rear Pitlock wheel skewers and the Pitlock headset lock, and all work very well. Also, the service from www.urbanbiketech.com is excellent.
Last edited by Blue Roads; 11-10-08 at 12:43 AM.
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Great suggestion, thanks.
I asked my LBS about it today. I've got the 28.6mm and 31.8mm clamps that Pitlock makes, but the LBS said they are unaware of a shim that goes from 31.8mm to 30mm. Last week, a different LBS tried to spread the 28.6mm and ease it onto the seatpost tube, but it wouldn't fit.
I believe 30mm is an uncommon clamp size for aluminum or carbon frame bikes, but a common size for a steel frame bike. This is for a steel frame.
My search continues.
Edited to add: I want to add that I have front and rear Pitlock wheel skewers and the Pitlock headset lock, and all work very well. Also, the service from www.urbanbiketech.com is excellent.
I asked my LBS about it today. I've got the 28.6mm and 31.8mm clamps that Pitlock makes, but the LBS said they are unaware of a shim that goes from 31.8mm to 30mm. Last week, a different LBS tried to spread the 28.6mm and ease it onto the seatpost tube, but it wouldn't fit.
I believe 30mm is an uncommon clamp size for aluminum or carbon frame bikes, but a common size for a steel frame bike. This is for a steel frame.
My search continues.
Edited to add: I want to add that I have front and rear Pitlock wheel skewers and the Pitlock headset lock, and all work very well. Also, the service from www.urbanbiketech.com is excellent.
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It's for a Surly frame, all of which are steel. And all Surly frames, except for one, take a 30mm collar.
It was an LBS I don't often visit. The 28.6mm, of course, looks like a close fit to a 30mm. As I was talking with the guy, he grabbed a spreading tool and casually tried to see if it would fit. He knew it wasn't going to, but we were both curious. Afterward, he measured the tube with calipers and confirmed it indeed requires a 30mm.
It was an LBS I don't often visit. The 28.6mm, of course, looks like a close fit to a 30mm. As I was talking with the guy, he grabbed a spreading tool and casually tried to see if it would fit. He knew it wasn't going to, but we were both curious. Afterward, he measured the tube with calipers and confirmed it indeed requires a 30mm.
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If you want to make a 31.8 mm collar fit you will need 0.035" (0.9 mm) shim stock. You can probably get this at an auto or industrial supply store.
I agree that trying to make the 28.6 mm collar fit was doomed to fail, particularly since you have to keep the clamp "ears" parallel.
I agree that trying to make the 28.6 mm collar fit was doomed to fail, particularly since you have to keep the clamp "ears" parallel.