BXT 24" build

[jefflinde]

It's childs play on 15 year old reba dual airs. The two I bought are about 120mm, but have a spacer to reduce it to 100mm. I 3d printer another spacer to shrink them to 80mm forks. Took $2 and 1 hour.

no way,  so you 3d printed a shorter spacer?  or is it a longer spacer?  would you be willing to make another and how much would you charge?  i was thinking it needed a whole new airshaft like the 29er rebas require.  could i

[Chris948]

no way,  so you 3d printed a shorter spacer?  or is it a longer spacer?  would you be willing to make another and how much would you charge?  i was thinking it needed a whole new airshaft like the 29er rebas require.  could i

If you look at the pic, the stock hard rubber spacer is on the left, that shortens the fork 20mm. I added the middle spacer, that reduced the fork another 20mm.

I mean I could help you, if your air side is identical, no problem. You could save time and money and have a local library or maker space print one. I used PETG but I doubt it matters much.

These reba dual airs are pretty sweet. After reducing the length for a 24" bike, you can either shorten or remove the spacer, which I did so it's a 120mm fork for my kids 26" bike.

[Chris948]

I never played with spacers but doesn’t that just affect the travel on the compressed side of the stroke, acting like a stop? What I was thinking was reducing the stroke length so that both lower and uppers could be shorter, to minimize the overall length and allowed a lower front end

It reduces the overall length. Rockshox sold the spacers years ago, it's a documented thing.

[Ludo]

That’s a great, I didn’t realize that! Opens up things nicely then, off to find a good 26” fork then

[Ludo]

Can the same be done on more modern 26 reba like the SL?

[Chris948]

Can the same be done on more modern 26 reba like the SL?

I have no clue. This was one clue a found a few years ago trying to understand. https://www.mtbr.com/threads/changing-travel-on-older-rockshox-reba-29-dual-air-fork.1075241/

[MartinCZ]

I am also considering this frame from BXT but with carbon fork. I do not think that my daughter needs a suspension fork for her style of riding and it adds weight too. But it seems that nobody produces 24er thru axle carbon fork, they have just standard QR version. The only one I have seen is on WOOM off5. Has somebody of you came across any 24er fork for thru axle?

About the length of cranks and fitting in general I found lot of inspiration on hupcc.com. They have completely different approach and prefer 28" wheels even for small frame sizes. So another option for a kid's bike (and an alternative to HUP) could be getting Chinese TARMAC SL8 clone or DOGMA F clone in size 44 (43). HUP suggest 44 size for 138+ cm body height. And the geometry is almost the same. Starting with flat handlebar and 26er wheels (if they fit) would be better for us. Standard open mould frames usually start with size 49 and it is too big.