Mag 21 info

[Pionir]

Hi,

Does anyone know which other Rockshox forks in the range shared the bolt-on crown that the Mag 21 had?

I'm after a crown/steerer assembly with a 1" threaded steerer and at least a 230mm of steerer. I see the Bikepro archive website shows they were available, they seem quite rare so I'm thinking if another fork has the same stanchion spacing I could expand my ebay criteria and hopefully find one.

I'm assuming each manufacturer used their own spacings so wouldn't be cross compatible.

Thanks, David

 

[jimo746]

Re:

I may be wrong, but I'd think the crown & steerer from the Mag10/20/30 would be interchangeable, and the Mag21 crown was the same spacing across the different years, although the fork brace design did change.

I'm sure one of our Rockshox experts can confirm if this is the case.

Also worth putting up a "wanted" ad in the relevant section, I'm sure someone out there has what you're looking for.

 

[stevemar]

Re:

I believe The quadras do as well, but of course it would have to be a q21r that had the crown with lowers bolted to it, not pressed in like most of them. Good luck with the search.

 

[FluffyChicken]

Re:

Any of the Mag will fit, as will Specialized of the same design.(just not the Judy style fsx circa 95+)
A Quadra will fit as long as it bolts off, not many did.

The design and quality changed through the years, but since it's threadless that shouldn't matter.

Also the ProForx crown from that era I think fit and some aftermarket AC and others are available

 

[Pionir]

I thought they were available both threaded and threadless? I'm after a threaded steerer... Is my assumption I can tap a thread onto a 1" threadless steerer if needed valid?

 

[jimo746]

Re:

I don't think the threadless steerer would be thick enough to take the threading and still be strong enough.
Plus putting threads onto a steerer can he tricky unless you've got the right (quality) die.

 

[Pionir]

Fair enough. Replacement Crown/Steerer is it then!

 

[FluffyChicken]

Re:

Misread. Try and avoid the earlier MAG30/20 steerers and early spesh fs steerers as they where recalled ;-)

Threaded steerers have all sorts of butting going on so you cannot alter them, you could at a push thread a threadless if you have access to the tools.
230mm was the max they did but that is one hell of a head tube on a bike . 200mm? Hence why they are not common and would be cut down for short tubes till the next size kicked in.
What bike is it for?

 

[Baulz]

I have always wondered if you can use the crown/steerer/stanchion assembly from an Indy fork with Mag lowers and internals?

 

[Pionir]

Re: Re:

Misread. Try and avoid the earlier MAG30/20 steerers and early spesh fs steerers as they where recalled ;-)

Threaded steerers have all sorts of butting going on so you cannot alter them, you could at a push thread a threadless if you have access to the tools.
230mm was the max they did but that is one hell of a head tube on a bike . 200mm? Hence why they are not common and would be cut down for short tubes till the next size kicked in.
What bike is it for?

Yes it's large! It's actually a 24.5" road frame and I'm hoping to get a Roubaix road fork in it which is based off the Mag21 components, but there were far more Mag21s sold so I thought i'd get more joy here than in the road section The old fork steerer is 226mm.