Originally Posted by
70sSanO
If you want to try a cheap suspension fork, try one. I've never bought into matching a rigid atc with a suspension. It should be within a reasonable difference, but there was a time when a lot of people were pushing the travel on old bikes. Rule of thumb used to be 1/2* change in HA for every 10mm.
My Serotta was originally a rigid with a suspension fork option of 46mm travel I'm running 70mm. Of course the HA was 72* so a little slack is not a problem. Likewise my Trek is spec'd for a 63mm, I'm running 80mm. But I'm a Bomber fan, so I can't vouch for Suntour.
As for Suntour, there are some on eBay that are probably closer to your rigid with a threaded steerer. Here is one that might tick enough boxes...
https://www.ebay.com/itm/Suntour-1-1-8-Threaded-26-QR-MTB-Bike-63mm-204mm-Suspension-Fork-V-Brake-NEW/133596887790?epid=17041841983&hash=item1f1afebaee:g
KAAAOSw7ixf80el
I'm far from a fork specialist, but with only 63mm of travel, how much pogo stick can you get, of course there could be a bottoming issue, but hopefully you can take out a lot of sag and that might help.
John
That fork is not adjustable in any way. It may have knobs but they don't do anything. All that fork will do is bounce around and screw up the geometry.