1 inch steer tube?

[Martin Harrison]

I have a fork with a 1 inch threadless steer tube but my frame was intended for 1 1/8 forks or 1 1/2. The I.D. of the head tube is 44 mm. Is there a safe way to run this? I may put a small motor on this too if that matters.

 

[Bicycle808]

What is your frame, exactly?

 

[Martin Harrison]

Why does that matter? It's actually a mini bike frame with a bicycle head tube. I want to run something like this http://www.ebay.com/itm/251983043534?_trksid=p2060353.m1438.l2649&ssPageName=STRK:MEBIDX:IT

 

[KJV]

Put a, 1" i.d. -1 1/8 ™ o.d.
sleeve over fork steertube.

 

[Bicycle808]

Why does that matter? It's actually a mini bike frame with a bicycle head tube. I want to run something like this http://www.ebay.com/itm/251983043534?_trksid=p2060353.m1438.l2649&ssPageName=STRK:MEBIDX:IT

I'm trying to figure out f your 44mm ID kis accurate. If it is, then kjv's advice:

Put a, 1" i.d. -1 1/8 ™ o.d.
sleeve over fork steertube.

--won't work, as that'd just shim down a 34mm headtube to 30.2mm. You'll likely have to fab a shim to go from 44 to 30.2 (or even 32.5, if you want to run an old-school headset); you're not likely to find any ready-made, off-the-shelf kludges.

 

[Bicycle808]

i'd be inclined to look for a 1.125" triple tree fork, and run an ec44/28.6 top and ec44/30 bottom headset. that'd be a plug-n-play set up.

 

[Martin Harrison]

They make 1.125 triples but they are a lot more than what i found. Close to $300 compared to the $70. If I can run a headset for the 44mm id for a 1.125 tube and shim it down to 1 I'm cool with that.

 

[Bicycle808]

Kludge away if you feel lucky,but i'd be leery of running a head set-up like that. Saving money makes neither dollars nor sense if the end result doesn't function.

 

[Bicycle808]

More info here: http://problemsolversbike.com/files/tech/shis_standards.pdf

 

[Martin Harrison]

Maybe I can machine the fork for a 1.125 tube? Seems to be enough material for that.

 

[KJV]

Well, the sleeve , I spoke of..
Worked fine for us, ran into the same problem about 5 years ago.
Machine it if you have the means.