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Old 12-21-2018, 09:31 AM   #1
James
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Race tech is recommending a lighter fork spring?

Whatís up guys? I am helping my father in law get into his first bike. We picked up a 2014 CRF250L. He is going to be riding out of Truckee, mainly, and wants to be able to explore all the open areas.

Heís a larger guy, about 240 before clothes. First thing we are going to tackle is suspension springs. Where I am getting confused is Race Tech is recommending a .5 kg/mm front spring. Stock is .72 kg/mm. I have a hard time with going with a lighter spring given the weight.

In case youíre wondering, the shock recommendation is a 12.5 kg/mm up from a stock 9.5 kg/mm.

Any thoughts that can help me understand?

James
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Old 12-21-2018, 09:34 AM   #2
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it looks like the stock fork setup only uses a spring in one leg, so the stock effective per leg rate is .36kg/mm

front ideal is 39% stiffer than stock, rear 32%. that's reasonable.
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Old 12-21-2018, 09:50 AM   #3
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Ah, just realized that they add a spring. And convert it to 2 front springs. I have a hard time understanding non-symmetrical front suspension. Thanks for the quick reply. Just save me a Tylenol or 2.
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Old 12-21-2018, 02:09 PM   #4
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I suppose it's possible that Racetech is suggesting mismatched to save a few bucks - I don't know, my numbers above are assuming that they're suggesting 2 .50 springs rather than .72 in one leg and .50 in the other
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Old 12-21-2018, 05:35 PM   #5
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Worth checking out Big Dogs recent CRF build.
https://www.bigdogadventures.com/HondaRally.htm
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Old 12-22-2018, 09:40 AM   #6
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Originally Posted by Junkie View Post
I suppose it's possible that Racetech is suggesting mismatched to save a few bucks - I don't know, my numbers above are assuming that they're suggesting 2 .50 springs rather than .72 in one leg and .50 in the other
That's how I read it. They sell a pair of .50 springs. My wording was a little confusing. I am just not wired to accept the forks not having identical internals. It seems to work, but i just don't like it. The old mono shock front suspension bicycles made me cringe. But, to each their own.

Thanks for the build thread. There seems to be a good group of people customizing these bikes. It's fun to see all their ideas.

James
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Old 12-22-2018, 11:23 AM   #7
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Join Date: Jun 2012
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Motorcycles: FXR thing, Buell Ulysses, Honda CRF250 Rally, Hawk GT's , and various others.
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I have a CRF250L Rally. Not exactly the same, but close. I went with Cogent Dynamics, and could not be happier. I've ridden the RaceTech setup as well, and it's quiet good. The stock suspension doesn't do this chassis justice.

Read about my bike and build here:https://www.citybike.com/stories/pre...y-adventure-1/

Part 2 is the suspension testing.
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Old 12-25-2018, 08:27 PM   #8
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Quick update. We ordered up the race tech recommended springs. Going to start with the proper spring rate and get him riding the bike. We have talked about the potential for upgrading the bike. He was able to jump on it, take off, and cruise the yard. We're off to a good start. I am going to put some telephone poles down and start practicing the technical stuff soon. We have enough junk laying around to make obstacles, and I am looking forward to riding with him. More to come!
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