Going to rigid fork. Non-suspension corrected OK?
08-16-18, 02:50 PM
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Going to rigid fork. Non-suspension corrected OK?
I picked up a 1999(?) Mongoose Pro DX Titanium MTB and am looking at switching the Rockshox Judy XC fork to a rigid fork. The axle-to-crown measures in at 420mm. *Edited here, because I dumb*
For 1999 the Rockshox Judy XC came in either a 63mm or 80mm travel option so if we assume sag is equal to 20% of travel, we're looking at ~13mm to ~16mm difference.
Honestly I can't tell if there is any sag at all. There is definitely travel on the shock, just not so sure about the sag. I have a Trek 820 with a cheap SR shock fork on there and I can tell that sags when I sit on it but not the Rockshox. I'll have to tape up the dust cover and do the zip tie trick just to make sure.
In any case, a Surly Troll non-suspension corrected fork is 420mm. Is that 13mm-16mm difference (~half an inch) that big of a deal? Any other traditional 26 rim brake fork options with rack mounts out there to consider? The Surly is nice and all but weighs as much as the Rockshox fork, ~3lbs!
For 1999 the Rockshox Judy XC came in either a 63mm or 80mm travel option so if we assume sag is equal to 20% of travel, we're looking at ~13mm to ~16mm difference.
Honestly I can't tell if there is any sag at all. There is definitely travel on the shock, just not so sure about the sag. I have a Trek 820 with a cheap SR shock fork on there and I can tell that sags when I sit on it but not the Rockshox. I'll have to tape up the dust cover and do the zip tie trick just to make sure.
In any case, a Surly Troll non-suspension corrected fork is 420mm. Is that 13mm-16mm difference (~half an inch) that big of a deal? Any other traditional 26 rim brake fork options with rack mounts out there to consider? The Surly is nice and all but weighs as much as the Rockshox fork, ~3lbs!
Last edited by zze86; 08-16-18 at 07:41 PM.
08-16-18, 11:55 PM
#3
glorified 5954
I am also hot onto this topic and looking at rigid forks. As far as I know, take the travel times .25 for the sag calc. Then subtract that from the Axle to Crown length and you've got your desired fork length. Please correct me if wrong, somebody.
If your 1999 fork doesnt sag I am not surprised as you can be sure that it needs a big service or replacement.
If your 1999 fork doesnt sag I am not surprised as you can be sure that it needs a big service or replacement.
