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Old 02-12-09, 07:57 AM   #1
globalrider
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convert 1 1/8 fork for use w/1" steerer

I'm planning to build a tandem from donor bikes and spare parts, I have a 1 1/8" triple tree suspension fork and the front donor bike has a 1" steerer tube. Can any of you clever bike hackers give me some clues about doing this without risking a broken neck and preferably without welding? I can design it so any front end additional length is between the head tube and the fork.
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Old 02-13-09, 10:08 PM   #2
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can you post a pic of how the steer tube is conected to the crown?I have some ideas but I need to see the fork.
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Old 02-16-09, 08:40 AM   #3
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can you post a pic of how the steer tube is conected to the crown?I have some ideas but I need to see the fork. I'll try to post pictures later today, thanks
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Old 02-26-09, 07:29 PM   #4
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can you post a pic of how the steer tube is conected to the crown?I have some ideas but I need to see the fork. I'll try to post pictures later today, thanks
Finally, without a working camera I had a hard time so I worked backwards and found the same fork on Ebay. The pic is attached and I added a link to the source the NYCBikes ebay store which is http://myworld.ebay.com/nycbikes/ in case the upload doesn't work or anyone else is inspired. .

Last edited by globalrider; 05-07-09 at 12:19 PM.
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Old 02-26-09, 09:28 PM   #5
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can you get another triple tree fork and swap out the legs?
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Old 02-26-09, 11:42 PM   #6
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I'm planning to build a tandem from donor bikes and spare parts, I have a 1 1/8" triple tree suspension fork and the front donor bike has a 1" steerer tube. Can any of you clever bike hackers give me some clues about doing this without risking a broken neck and preferably without welding? I can design it so any front end additional length is between the head tube and the fork.
The question came up once before and someone suggested outboard bottom bracket bearings as a way to run a 1 1/8 fork in a 1 inch head tube.

How about replacing the steerer tube on the fork?

Or cut out a head tube and some or all of a top tube and downtube from another frame and lug than in place of your donor bike's frame.
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Old 02-28-09, 04:36 PM   #7
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replace steerer tube.

I am leaning towards replacing the steerer tube on the fork. Overall I figured that the triple tree would be stronger than a regular fork. If the 1" steerer from the original fork would slip inside the 1 1/8" tube I would double them up but I don't think it's that much smaller.
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Old 03-03-09, 08:36 PM   #8
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Well a regular triple tree fork would be stronger, but not that one, it's a kinda cheapo suspension fork.
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Old 03-09-09, 12:28 PM   #9
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1"-1 1/8

sorry it took me so long to post back . after looking at the pix the first thing I thought is just get another fork that fork is not of very high quallity it would be more cost effective to just buy or find a new one . take it to a machine shop and the can make you a steer tube that will be safe.
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Old 03-09-09, 02:23 PM   #10
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if you use a fork like that on a tandem you will kill yourself when it fails
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Old 03-31-09, 07:07 PM   #11
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The question came up once before and someone suggested outboard bottom bracket bearings as a way to run a 1 1/8 fork in a 1 inch head tube.
Any more info on this? Sounds interesting.
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Old 04-21-09, 02:50 AM   #12
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some bikes with 1" steerers can use 1 1/8" forks too

some 90s Raleigh MTBs. Max
have to measure the headstock
then change the headset to match the forks
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