Rigid Fork Choice
Ok, this will be simple, but I need a sanity check.
I am riding a 2009 GT Avalanche 2.0 with a crappy Suntour 100mm fork. I am looking to switch to a rigid fork to use mainly around town and some limestone paths.
Nashbar has their house brand forks on sale now, plus free shipping, so I am looking at specs for the disk-compatible forks.
My question is about axle-to-crown distance. My current fork is 100mm travel, with a 420mm atc distance. The nashbar mtb fork is 450 and the nashbar touring/cx fork is 370mm. Both forks have disc mounts and should fit a 26" tire fine.
Which fork would result in better geometry? I understand that the touring fork will effectively lower the front end by 50mm, while the mtb fork will raise it by 30mm. Will I notice a difference on either one?
What else am I missing? I dont typically fool around with geometry things, so I am not sure of the result on ride/handling/etc.
Free shipping over today, so answers/thoughts would be appreciated.
Hope you got the mtb fork. I noticed that titususa has the on-one rigid disc cro-mo fork back on sale, though not nearly as cheap as the nashbar, it's much lighter.
100mm equivalent rigid fork is ~440mm AC length, ~75mm travel equivalent =420, ~390= for a non suspension corrected frame, 370=road fork equivalent. Though with the 370mm AC, toss a 29r wheel on front to bring it back up a bit and run it 69r style.
Find the proper length fork! Both of those change the geometry drastically.
I would make suggestions, but I dont know about 26er forks.
Raised in a Chicken-Coop by Chickens
Salsa Cromoto 26" forks (disc only) are 440mm iirc.
I had them, but the reduction in A-C made the bike too twitchy. I now have a squishy 140mm fork that I run at 25-30mm sag, and the slacker handling is much better. Great for just cruising around.
I ended up doing nothing. I wasn't confident in the Nashbar fork, so I passed for now. However, I think the A-C on the Suntour is actually a bit more, as I was measuring to the inside of the top of the fork, not the top where the crown race is installed.
Haven't taken the more accurate measurement yet, but I bet it would be more in line with the Nashbar measurements. Since Nashbar runs a sale every week it seems, I will keep an eye out for a deal again.
forgot to mention, you should account for sag when measuring the current fork, so actual AC length will be the measured AC at full extension minus 10-20%,,,
Just to be clear, that's minus 10% - 20% of suspension travel. Not minus the percentage of overall A-C length. Thus, for a 100mm fork measured statically at (for example) 490mm you'd want maybe 470 - 480mm A-C. If you removed 10% - 20% of overall A-C you'd be looking at a 392mm - 441mm A-C which would be WAY off.
Originally Posted by logbiter
good call, got distracted and didn't finish that thought! thanks!
Originally Posted by c0nsumer
I have a Nashbar mountain rigid fork. It is approx. 457mm without the crown race installed...if that helps.
...and I would say it's on the heavy side.(compared to my circa 2007-8 Zion 26er fork.
I also have a fork from this ebay seller that was advertised as cromo, but it looks exactly like this hi-ten fork for cheep.
Rigid Hi Ten Steel MTB Mountain Bike Fork Black 1 1 8 26" Disc Brakes Threadless | eBay
it appears to be OK...but the dropout slots are wider than usual...
...Does anyone know if this is OK? is there something that can be done to fix this?
If not,I hope anybody who considers this fork reads this before buying.but maybe mine was defective...I donno.
This one is between 400 and 410mm a to c. and not as heavy as the Nashbar.
if anybody wants a "heavy-duty" rigid fork,the Nashbar is the ticket.LOL
i have more than you.
...because i have me and you.
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