Old DJ frame tapered fork adapter?

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Old DJ frame tapered fork adapter?
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flag mikeylikebikey
Posted: Aug 20, 2022 at 11:57 Quote
I got an old Norco 250 Its head tube has the same races as a bmx bike which is IS41 so 41mm which was used alot more for bikes along time ago i guess and has been the standard for bmx for along time now. Has any one every adapted a frame with this IS41 head tube to fit a tapered fork 11/8 to 1.5

Something like a lower adapter cup going 41mm to 44mm

Has anyone used something like this in anyway way buying one making one customizing a similar built one they bought?
I would really love to be able to throw any old for on my old DJ im kinda attached to it plus its chromoly that shit last forever haha also im kinda broke and wanna buy random used forks to try out on it even some of those Chinese forks maybe i figure as long as i dont jump to crazy i could abuse all sorts of cheaper forks and also have a nice used set that i rebuild.
flag mikeylikebikey
Posted: Aug 20, 2022 at 12:23 Quote
I forgot to say here are some diagrams and products i found i found weeks ago I found more but am to lazy to deep dive into the chinese markets right now.

https://singletrackworld.com/forum/topic/tapered-fork-1-1-8-1-5-in-a-straight-1-1-8-head-tube/

https://www.merlincycles.com/blog/buyers-guide-to-mountain-bike-headsets/

https://www.chainreactioncycles.com/ca/en/nukeproof-neutron-bottom-headset-cup/rp-prod124574?gs=1&sku=sku446549

yall think the EX44-40 for this one would fit ?

https://www.alibaba.com/product-detail/ANTOR-Bicycle-Headset-42-41-8mm_1600550885974.html?spm=a2700.galleryofferlist.normal_offer.d_title.70b65324DE3F6c
flag melanthius
O+
Posted: Aug 20, 2022 at 14:54 Quote
I've never heard of an adaptor that goes from IS41 to something like IS52 which is what would be needed for a tapered steerer. The EC44 lowers let you put a tapered steerer in a 44mm headtube that can also accept a ZS44 lower and a straight steerer. Your IS41 headtube isn't intended to have anything pressed into it, like the EC and ZS headsets operate. Your headtube's only toleranced surfaces are the angled shoulders where the bearings rest directly. Hell, even IS41 anglesets are only available from one manufacturer (9pointCool , don't work with every headtube, and require an internal tensioning system to maintain alignment. I doubt anyone is ever going to make what you're looking for.

I know you said you were wanting to go cheap, but I think you should save up and get a straight steerer Manitou Circus Expert for around $500US. It'll last, it works really well, and you'll be able to find a headset that will let it work in any frame.
flag muddytreker
Posted: Aug 22, 2022 at 5:04 Quote
Most forks you can change the tapererd steerer to straight steerer,
press the old one out and press the new one in with adapter ring if needed.
flag mikeylikebikey
Posted: Sep 6, 2022 at 21:51 Quote
muddytreker wrote:
Most forks you can change the tapererd steerer to straight steerer,
press the old one out and press the new one in with adapter ring if needed.

Thank man ive heard of that but never thought of it before I also have no idea how to do that or where and how to get a new straight steerer and adapter but i bet if i looked hard enough i could find out.
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