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Replacing the OE suspension fork with a rigid fork on my hybrid

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Replacing the OE suspension fork with a rigid fork on my hybrid

Old 08-14-11, 01:51 PM
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Barrettscv 
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Replacing the OE suspension fork with a rigid fork on my hybrid

I have a 2007 Giant Cypress hybrid bike that has 700c wheels. The bike is a good utility and winter bike, but the worthless suspension fork is doing more harm than good. The fork just bounces up and down, robbing power as I pick up the effort.

I've found a rigid steel fork that looks like it might fit, but I'm unsure due to a lack of data on the RST SOFI 'T' Suspension, 63mm travel Giant fork.

The rigid fork is the Surley Karate Monkey 29er fork;

"The Karate Monkey rigid fork replaces suspension forks designed for 29"-wheeled bikes. It features 51mm International Standard disc mounts, removable canti pivots, 1-1/8" threadless steerer, tapered straight blades, and a black powdercoat finish".

Axle-To-Crown: 468mm axle to crown
Rake: 43mm
Steerer: 260mm
Weight: 2.59 lbs. (1.18 kg)

The axle to crown distance looks good. Will this fork fit? Can I use my existing headset & stem?

Last edited by Barrettscv; 08-14-11 at 01:57 PM.
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Old 08-14-11, 02:05 PM
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Your existing headset and stem should transfer just fine. You may want to buy a new crown race though rather than mess with removing the old one. It can be done (sometimes requiring specialized tools) but it may cost you more time/money than it's worth. That axle to crown height sounds a bit high for a bike that came with a 63mm fork. This site claims it's corrected for 85mm of travel: https://www.universalcycles.com/shopp...0&category=703

With that said, the 468mm a-c height seems fairly standard. Unless you went with a cross fork at around 400mm a-c you don't have any other options. The geometry difference will likely be so small as to be meaningless anyway. Don't forget to adjust the angle of your saddle to correct for the bike's new stance though.
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Old 08-14-11, 02:07 PM
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Since you have disc brakes and therefore don't have to worry about the location of cantilever studs, you might also consider the Surly Troll fork. It's a little shorter axle-to-crown and features lowrider mounts, including on the inboard side of the fork leg. This comes in useful if you want to use a lowrider front rack without a cross-hoop, like my old Blackburn CL-1s:



From a fit standpoint, that will work fine in place of your RST, they're both your normal 1 1/8" threadless. There are three tasks that may require specialty tools or some elbow grease: removing the headset's crown race from the old fork and installing it on the new one, cutting the steertube to length, and installing the star-nut into the end of the steer tube for your headset's top bolt to have something to pull on. The fork won't come with a star-nut, so get one of those while you're at it.
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Old 08-14-11, 02:43 PM
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You measure the Sus fork by having someone else measure it while you are sitting on it?
there some sag from the rider weight, that can change things a bit.

The hoop is useful. fitted my Headlight on the cross hoop on my low rider Rack..
and have a long fender on the front, it is attached there in front.
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Old 08-14-11, 02:46 PM
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I'm glad to hear that the Surly fork will fit the Giant frame and that parts will interchange. Before having the work done, I'll compare the two forks to see if the length is close. I might still fit the bike with a small change in length, but I'm hoping the axle to crown length is the same.
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Old 08-14-11, 03:00 PM
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You don't want it exactly the same because you need to account for the fork sagging.
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Old 08-14-11, 03:27 PM
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Originally Posted by joejack951 View Post
You don't want it exactly the same because you need to account for the fork sagging.
AHhhh...

So I should sit on the bike & measure the axle to crown distance?
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Old 08-14-11, 07:25 PM
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Yes, measure with weight on the fork. Surly has the 1x1, Troll, BD and Instigator forks in different sizes. https://surlybikes.com/parts/category/forks/

Last edited by alan s; 08-14-11 at 07:31 PM.
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