I'm making a seatmast Franken-cap, and need some building advice...
05-23-16, 03:52 PM
#26
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Thanks for the idea!
[EDIT: I just sent Calfee a message about this. I'll update is I hear anything.]
Last edited by Wheever; 05-23-16 at 04:02 PM.
05-24-16, 07:15 AM
#27
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if you think that a stock seat mast is expensive, asking a custom builder for a custom one is probably not your best path
05-24-16, 11:25 AM
#28
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Well I don't, particularly. They're about the same price as any decent carbon seatpost. But the clamp on this thing is for ****, and it would be worth the $ to me to be able to keep my saddle where I want it, and accurately and precisely adjust it when I wish to. At the moment I'm resorting to sharpie marks on the clamp (since it has no marking on it for angle) and on the saddle rails, and carrying a torque wrench with me. (There are no 17nm clickers to be found, so it's a full-blown torque wrench.) A big pain in the butt, all the way around.
05-24-16, 02:01 PM
#29
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A couple of thoughts.
Is the mast and topper round?
The first might be to hunt for something like a 32 or 34.9mm seatpost and see if it would have an ID adequate to just slide onto your seatmast. If so, then it should be easy enough to simply cut it to length, notch for adjustment, and add a reverse clamp at the bottom. Perhaps minimal reaming to fit.
If you can't find an appropriately sized MTB seatpost. Then, rather than cutting up your existing seatmast topper, I'd look for a piece of aluminum tubing that would slide on top of the mast. Then again, use a reverse clamp at the bottom, and epoxy the donor seatpost head (top end of the post) into place. Give yourself a few inches of overlap if you have space.
Is the mast and topper round?
The first might be to hunt for something like a 32 or 34.9mm seatpost and see if it would have an ID adequate to just slide onto your seatmast. If so, then it should be easy enough to simply cut it to length, notch for adjustment, and add a reverse clamp at the bottom. Perhaps minimal reaming to fit.
If you can't find an appropriately sized MTB seatpost. Then, rather than cutting up your existing seatmast topper, I'd look for a piece of aluminum tubing that would slide on top of the mast. Then again, use a reverse clamp at the bottom, and epoxy the donor seatpost head (top end of the post) into place. Give yourself a few inches of overlap if you have space.
05-24-16, 02:34 PM
#30
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Thread Starter
A couple of thoughts.
Is the mast and topper round?
The first might be to hunt for something like a 32 or 34.9mm seatpost and see if it would have an ID adequate to just slide onto your seatmast. If so, then it should be easy enough to simply cut it to length, notch for adjustment, and add a reverse clamp at the bottom. Perhaps minimal reaming to fit.
If you can't find an appropriately sized MTB seatpost. Then, rather than cutting up your existing seatmast topper, I'd look for a piece of aluminum tubing that would slide on top of the mast. Then again, use a reverse clamp at the bottom, and epoxy the donor seatpost head (top end of the post) into place. Give yourself a few inches of overlap if you have space.
Is the mast and topper round?
The first might be to hunt for something like a 32 or 34.9mm seatpost and see if it would have an ID adequate to just slide onto your seatmast. If so, then it should be easy enough to simply cut it to length, notch for adjustment, and add a reverse clamp at the bottom. Perhaps minimal reaming to fit.
If you can't find an appropriately sized MTB seatpost. Then, rather than cutting up your existing seatmast topper, I'd look for a piece of aluminum tubing that would slide on top of the mast. Then again, use a reverse clamp at the bottom, and epoxy the donor seatpost head (top end of the post) into place. Give yourself a few inches of overlap if you have space.
I've looked into that, but I haven't located a carbon seatpost with a 30.2 ID. Or even an aluminum one with a 2-bolt clamp. If Calfee doesn't get back to me, I think the next best idea is a 27.2 with a carbon tube sleeve like the one I linked above. After that, making a 30.x fit with a combination of sanding the ID of the cap and the OD of the donor seatpost.
This really should be easier. Sigh.
05-24-16, 03:24 PM
#31
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I just found this website with this post and messaged them to see if they would do it, and how much it would cost.
Carbon Seat Post Modification UCI Legal - Jack Kane Custom Racing Bicycles - Professional Custom Painted Bicycles. USA Built to Order
Carbon Seat Post Modification UCI Legal - Jack Kane Custom Racing Bicycles - Professional Custom Painted Bicycles. USA Built to Order
05-24-16, 03:50 PM
#32
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I know CF is nice, but does it really have to be CF? Aluminum may be a bit more forgiving to play around with.
30.2mm ID???
A 34 or 35mm OD post may be similar to 30.2mm ID, but I suppose you'd have to be really lucky.
It would be an odd request, but I'm seeing a few 34 and 35mm CF seatposts on E-Bay. Perhaps the sellers could confirm the ID/OD measurements. One might be able to sleeve or ream it slightly to adjust if needed.
4ZA Carbon Black Road Bike Seatpost 35cm | eBay
Carbonlite Carbon 2 Bolt Bike Cycle Seatpost Road 34mm Extra Long 23" Used | eBay
Otherwise, perhaps snag a 30.2 post, with exactly the same OD as your mast. Then all you need is to find/make the appropriate tube/sleeve.
New Carbon Alloy Seatpost 30 2 x 350mm | eBay
30.2mm ID???
A 34 or 35mm OD post may be similar to 30.2mm ID, but I suppose you'd have to be really lucky.
It would be an odd request, but I'm seeing a few 34 and 35mm CF seatposts on E-Bay. Perhaps the sellers could confirm the ID/OD measurements. One might be able to sleeve or ream it slightly to adjust if needed.
4ZA Carbon Black Road Bike Seatpost 35cm | eBay
Carbonlite Carbon 2 Bolt Bike Cycle Seatpost Road 34mm Extra Long 23" Used | eBay
Otherwise, perhaps snag a 30.2 post, with exactly the same OD as your mast. Then all you need is to find/make the appropriate tube/sleeve.
New Carbon Alloy Seatpost 30 2 x 350mm | eBay
05-24-16, 04:35 PM
#33
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I suggest you actually press forward and try it. It really isn't anywhere near as hard as people are making it out to be. Paralysis by analysis.
Get your hands a bit dirty, you will surprise yourself.
Aluminum may seem like an option but it will fuse with the carbon before you know it if you're not careful.
The cut-off larger post fitted over a smaller one with a reversed clamp is a surprisingly effective option since many larger posts will be very close to 27.0 ID
Get your hands a bit dirty, you will surprise yourself.
Aluminum may seem like an option but it will fuse with the carbon before you know it if you're not careful.
The cut-off larger post fitted over a smaller one with a reversed clamp is a surprisingly effective option since many larger posts will be very close to 27.0 ID
05-24-16, 05:44 PM
#34
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05-24-16, 09:27 PM
#35
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05-25-16, 11:26 AM
#36
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I found a reference for a 30.6 seatpost for the Dave Kirk JKS oversize frame. Kirk Frameworks | Custom Bicycles email or call him is my suggestion
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Life is too short not to ride the best bike you have, as much as you can
(looking for Torpado Super light frame/fork or for Raleigh International frame fork 58cm)
