Threadless steer tube extender
02-29-08, 03:03 PM
#1
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Threadless steer tube extender
My road bike has a 1 1/8 threadless carbon fork w/ integrated headset, metal steer tube. I have a 90mm 7 degree stem and the reach seems about right. (I've tried 80 and 100).
I'd like to get a little more height for the handle bars. I've tried stem flipped up and down - there is a tiny difference, but not major. My options are to get a higher angled stem or a steer tube extender. Oh, I guess I could buy a new fork, but I'm not going to.
There are also two extenders that appear to be available. I'm familiar with the ones that clamp onto the steer tube and extend upward.
Attached below is a photo another kind I stumbled across. The accompanying text says:
Size: 28.6/25.4
Adapter that enables you to make your steering tube longer
Does not effect the function of the Ahead system
Compatible with threaded and threadless headsets
Comes with a lightweight alloy BBB Roundhead head cap
Has anyone used one of these? Will it work for what I need?
I'm thinking I'd have to remove the star nut and place this inside the steer tube. The expansion wedge at the bottom would connect it solidly to the steer tube. I'd then have to set the bearings by pulling up on it, or maybe the star nut would then go inside the extension tube?
Anyway, for $12, I might just buy one and try it, but I was wondering if anyone was familiar with this thing.
Thanks in advance.
I'd like to get a little more height for the handle bars. I've tried stem flipped up and down - there is a tiny difference, but not major. My options are to get a higher angled stem or a steer tube extender. Oh, I guess I could buy a new fork, but I'm not going to.
There are also two extenders that appear to be available. I'm familiar with the ones that clamp onto the steer tube and extend upward.
Attached below is a photo another kind I stumbled across. The accompanying text says:
Size: 28.6/25.4
Adapter that enables you to make your steering tube longer
Does not effect the function of the Ahead system
Compatible with threaded and threadless headsets
Comes with a lightweight alloy BBB Roundhead head cap
Has anyone used one of these? Will it work for what I need?
I'm thinking I'd have to remove the star nut and place this inside the steer tube. The expansion wedge at the bottom would connect it solidly to the steer tube. I'd then have to set the bearings by pulling up on it, or maybe the star nut would then go inside the extension tube?
Anyway, for $12, I might just buy one and try it, but I was wondering if anyone was familiar with this thing.
Thanks in advance.
02-29-08, 03:45 PM
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I haven't used one like you're showing, but I've used one of these - https://www.nashbar.com/profile.cfm?c...%20ATB%20Stems - and it worked fine.
I guess one clamps from the inside, and one clamps from the outside. The one you show does look like a more elegant design. Check with the manufacturer and make sure it's not intended for steel forks only. Depending on the fork, a real light aluminum steerer, which is intended to be clamped from the outside, might deform, crack, or worse. I bolted the Delta Ahead Stem Riser onto the outside of a steel MTB fork, so I was able to torque it down without concern.
The other thing to keep in mind; is that while either of these solutions will raise lift and support your bars just fine (imagine the concept gave their liability lawyers fits!) if you're hucking your mountain bike, or sprinting your road bike for all it's worth, neither is a substitute for the correct fork, spacers and stem. In other words, the risers are adequate for cruising around, but not for higher performance or competition cycling.
DanO
I guess one clamps from the inside, and one clamps from the outside. The one you show does look like a more elegant design. Check with the manufacturer and make sure it's not intended for steel forks only. Depending on the fork, a real light aluminum steerer, which is intended to be clamped from the outside, might deform, crack, or worse. I bolted the Delta Ahead Stem Riser onto the outside of a steel MTB fork, so I was able to torque it down without concern.
The other thing to keep in mind; is that while either of these solutions will raise lift and support your bars just fine (imagine the concept gave their liability lawyers fits!) if you're hucking your mountain bike, or sprinting your road bike for all it's worth, neither is a substitute for the correct fork, spacers and stem. In other words, the risers are adequate for cruising around, but not for higher performance or competition cycling.
DanO
Last edited by Bottomfeeder; 02-29-08 at 03:51 PM.
02-29-08, 05:14 PM
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Where do they sell these?
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This is Africa, 1943. War spits out its violence overhead and the sandy graveyard swallows it up. Her name is King Nine, B-25, medium bomber, Twelfth Air Force. On a hot, still morning she took off from Tunisia to bomb the southern tip of Italy. An errant piece of flak tore a hole in a wing tank and, like a wounded bird, this is where she landed, not to return on this day, or any other day.
This is Africa, 1943. War spits out its violence overhead and the sandy graveyard swallows it up. Her name is King Nine, B-25, medium bomber, Twelfth Air Force. On a hot, still morning she took off from Tunisia to bomb the southern tip of Italy. An errant piece of flak tore a hole in a wing tank and, like a wounded bird, this is where she landed, not to return on this day, or any other day.
