Author Topic: 1" fork to 1 1/8" threadless forks conversion (Read 8519 times)

ED209 · « **on:** December 04, 2011, 09:15 AM »

How to ( From GlobalFlat ) on how to do the threaded to threadless conversion to make 1 1/8 forks fit a 1" frame

http://www.global-flat.com/smf/index.php'topic=28925.0

Thanks to James Voivod for the link

DiscoStu's advice...

"Yes I have just done my 92 master. I used the cups from a new beartrap 2 headset. I then sorted through my bits box and managed to find some old 1"1/8th aheadset parts with bearings and crowns that fitted into the cups without any machining. If you don't have any 1"1/8 spare headsets buy a Savage 1"1/8th from Dave at the rad bmx shop for just under £9. The top bearing and seals and bearing tapered crown will fit without any problems. The bottom bearing race will fit into the cup if it's pressed in place but won't move around freely. I took the bottom cup and bearing down to my local engineering firm and they popped it in the lathe and took a thou off. The bearing spun nice and free. It cost a fiver.
All in all this is not a cheap conversion.
1" Beartrap 2 from eBay around £23-£28 from eBay
Savage 1"1/8th headset from rad bmx shop for £9
Engineering costs to machine the Lower cup £5
All in around £30. Then a different stem and forks.
But it won't come loose like the threaded ones! So well worth it for a rider!"

HEYWOOD BMX · « **Reply #1 on:** December 04, 2011, 09:36 AM »

http://www.global-flat.com/smf/index.php'topic=28925.0

Wadz · « **Reply #2 on:** December 04, 2011, 09:54 AM »

Slowly slowly catchy new skool

ED209 · « **Reply #3 on:** December 04, 2011, 10:13 AM »

Quote from: wadz on December 04, 2011, 09:54 AM

Slowly slowly catchy new skool

you're not STILL bitter

ED209 · « **Reply #4 on:** December 04, 2011, 10:14 AM »

Quote from: VOIVOD on December 04, 2011, 09:36 AM

http://www.global-flat.com/smf/index.php'topic=28925.0

cheers BIG James

fugazi · « **Reply #5 on:** December 04, 2011, 10:26 AM »

There's a few ways of doing this, just watch which headset cups You use as some of them won't go over the 1 1/8 steerer. ED I've got some 1" threadless forks, a heavy duty 1" aheadset & a shim to use a 1 1/8 stem if You want to go that way

Dark Diggler · « **Reply #6 on:** December 04, 2011, 10:31 AM »

cool that, but why? I havent adjusted my 1" beartrap since I installed it on my Holmes and my Challenger has raced for 3 years with hardly any adjustment to its 1" beartrap, they both have the seatclamp style headlocks.

Spen69 · « **Reply #7 on:** December 04, 2011, 10:50 AM »

Like we chatted about last night Ed, this is my next LLP innovation plannned for my Badlander after the "current" development is sorted

ED209 · « **Reply #8 on:** December 04, 2011, 11:36 AM »

Quote from: Dark Diggler on December 04, 2011, 10:31 AM

cool that, but why? I havent adjusted my 1" beartrap since I installed it on my Holmes and my Challenger has raced for 3 years with hardly any adjustment to its 1" beartrap, they both have the seatclamp style headlocks.

it more about running a newer type stem on threadless forls than the headset Si - just trying to keep one foot in the past with an eye on the future

or the other way round

Betty · « **Reply #9 on:** December 04, 2011, 09:43 PM »

Ed just give in and buy a new school bike....

You can even put tanwalls on em...

ED209 · « **Reply #10 on:** December 04, 2011, 09:46 PM »

Quote from: Betty on December 04, 2011, 09:43 PM

Ed just give in and buy a new school bike....

You can even put tanwalls on em...

I nearly did mate... had 5 watched on ebay... but I would have regretted it

Got my 94 Sport rollin now - bit of extra length and beefier all round ... happy days

ED209 · « **Reply #11 on:** January 04, 2012, 11:45 AM »

bump for MonkeyBat

Discostu · « **Reply #12 on:** January 04, 2012, 12:22 PM »

Here is my latest conversion. With a one off Cnc machined Haro group 1 1"1/8th custom made stem.

Cheers stu

Discostu · « **Reply #13 on:** January 04, 2012, 12:31 PM »

Here is another one I done on my 1989 pk ripper.

As you can see I'm getting quite good with these conversions.

griff · « **Reply #14 on:** January 04, 2012, 12:44 PM »

that haro stem is ace

ED209 · « **Reply #15 on:** January 05, 2012, 03:05 PM »

just got my Mirra 540 air back after Yodel ( NEVER USE YODEL ) lost it trying to deliver it to Wales so the guy on ebay cancelled it then they tried to return it to me then sent it back to Wales... TWICE.

MUPPETS.

Anyways... I have some nice Haro 1 1/8 forks now to try on my Sport... will post up pics of the process when Keith gets time to do it

Discostu · « **Reply #16 on:** January 05, 2012, 04:39 PM »

Ooh. I'm looking forward to this ed. just get together as many old headsets as possible and see what bearings will fit into the cups. You can find out what will work without even fitting it to the bike.

ED209 · « **Reply #17 on:** January 12, 2012, 06:17 PM »

dunnit - worked a treat - pics & thread to follow

Discostu · « **Reply #18 on:** January 12, 2012, 06:41 PM »

Well done ed. I will look out for the thread. It's a really easy conversion to do. Are you going to put all the info into one thread then sticky it?

Skid · « **Reply #19 on:** January 31, 2012, 03:45 AM »

This maybe a stupid question but...

If your 1 1/8th fork stem fits into the 1 inch cups already attached to your frame, do you need to buy a Beartrap headset?

CD17 · « **Reply #20 on:** January 31, 2012, 07:30 AM »

Quote from: Skid on January 31, 2012, 03:45 AM

This maybe a stupid question but...

If your 1 1/8th fork stem fits into the 1 inch cups already attached to your frame, do you need to buy a Beartrap headset?

No you don't

I remember Rombloke (anyone remember him) doing a thread about this years ago

discostu that Group 1 is quality

Skid · « **Reply #21 on:** January 31, 2012, 02:56 PM »

Nice one

Author Topic: 1" fork to 1 1/8" threadless forks conversion (Read 8519 times)

HEYWOOD BMX

griff

Skid

Skid