Cracked Rim - Chicagoland Sportbikes
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post #1 of 24 (permalink) Old 05-08-2014, 10:44 PM Thread Starter
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Cracked Rim

Any suggestions on how to handle this? Have it welded or just replace the rim?




-Chris
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post #2 of 24 (permalink) Old 05-09-2014, 09:37 AM
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I wouldn't even think of trying to fix it. That's an accident waiting for a place to happen.

I've had a wheel explode in the middle of a race and when the bike wants to stop before you do it can get ugly.

On the KX500 i've even had the spoke holes crack.New rim, spokes, and spoke nipples.

it's not the fall that kills you, it's that sudden stop
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post #3 of 24 (permalink) Old 05-09-2014, 11:10 AM
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post #4 of 24 (permalink) Old 05-09-2014, 11:18 AM
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I agree that is dangerous, get a new rim, warp 9 ( works with stock spokes) can be had for cheap and I have 1 , so far it has held up to my fat ass, or get a did dirtstar or excel if you got the $$ (you will need new spokes/nipples with these)

I have built hundreds of bicycle wheels from scratch in the olden days and done several MX wheels in the last couple years, if you do not want to do this yourself I can help
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post #5 of 24 (permalink) Old 05-09-2014, 12:48 PM
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Replace it, but also look into will's rim repair.

http://willsrimrepair.com/
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post #6 of 24 (permalink) Old 05-09-2014, 02:26 PM
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Eat a Salad

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post #7 of 24 (permalink) Old 05-09-2014, 07:49 PM Thread Starter
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A new hoop it is. I was little leery myself of having it welded but seems a lot of people go that route from what I've read. It also appears the cracks are along the factory weld too.

The factory KTM wheels are excel AL7s. So an aftermarket rim like an excel takasago should lace right up without needing to buy new spokes/nipples right? Anyone know of a shop in the Chicago area, preferably west/nw suburbs that might stock these? Need a 21x1.6. Just trying to get the bike race ready for Sunday if possible.

Dave, thanks for the offer. I'll let you know.

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Eat a Salad
Oh no he didn't!

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post #8 of 24 (permalink) Old 05-09-2014, 08:45 PM
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If you are relacing anyway black rims are nice!

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post #9 of 24 (permalink) Old 05-09-2014, 10:58 PM
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I have a 300 exc with perfect rims . Priced right .

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post #10 of 24 (permalink) Old 05-12-2014, 10:14 AM Thread Starter
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Just to follow up, I ended up ordering a D.I.D Dirt Star LTX rim from my friendly neighborhood moto shop, TZR. Should have it in a couple days.

Planning on giving it a go at lacing/truing it up myself. I've dabbled in truing mtb rims so we'll see how it goes...

-Chris
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post #11 of 24 (permalink) Old 05-12-2014, 02:24 PM
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Next time break the wheel in half! This is embarrassing. I know you can do better.

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post #12 of 24 (permalink) Old 05-12-2014, 10:51 PM
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Did the old spoke nipples all come loose without rounding them?

nipples

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post #13 of 24 (permalink) Old 05-13-2014, 12:03 AM Thread Starter
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Quote:
Originally Posted by Chicago Performance View Post
Next time break the wheel in half! This is embarrassing. I know you can do better.
Just wait until my first ride on a newly laced wheel by yours truly. I'll show you better!

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Originally Posted by Ohfugit View Post
Did the old spoke nipples all come loose without rounding them?

nipples
All it took was a little elbow grease and my warm gentle breath and they all loosened up without any fuss. You know what imatalkinbout.

-Chris
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post #14 of 24 (permalink) Old 05-13-2014, 12:04 AM Thread Starter
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Quote:
Originally Posted by Hman675 View Post
All it took was a little elbow grease and my warm gentle breath and they all loosened up without any fuss. You know what imatalkinbout.
No, I don't know what you're talking about.

-Chris
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post #15 of 24 (permalink) Old 05-13-2014, 12:11 AM
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Quote:
Originally Posted by Hman675 View Post
Just wait until my first ride on a newly laced wheel by yours truly. I'll show you better!



All it took was a little elbow grease and my warm gentle breath and they all loosened up without any fuss. You know what imatalkinbout.
Well not personally but I've heard rumors

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post #16 of 24 (permalink) Old 05-16-2014, 11:20 AM Thread Starter
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I had a little time to work on this the other night and so far so good. I'm seeing runout, both axially and radially, aprox equal to .5 mm. That's acceptable for an off road wheel right? Having issues with my manual cd(wish ktm offered a paperback) so I haven't been able to find the exact spec. Searching around online I've found specs ranging from .7 - 2 mm I want to say.

Also, just curious, but out of the 10 people that visit this site and of those 10 who true their own wheels, do you prefer to use the "ping" method or a torque wrench for setting spoke tension?



Quote:
Originally Posted by Ohfugit View Post
Well not personally but I've heard rumors
They're all true?

-Chris
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post #17 of 24 (permalink) Old 05-16-2014, 03:24 PM
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I have a bike spoke tension gauge not sure it will work on mc's though.

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post #18 of 24 (permalink) Old 05-16-2014, 03:58 PM
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ping is fine, the rim will not be as true as a bicycle rim no matter how hard you try
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post #19 of 24 (permalink) Old 06-05-2014, 12:14 PM Thread Starter
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Just a follow up. I've got about 3hrs on it now and so far so good. Spent a lot of time banging into logs on the endurocross section at FVOR. Checked the spokes after that ride and none of them loosened up. Still as true as it was at the start. I'll continue to keep an eye on it though. Also, I didn't use a torque wrench and just tightened the spokes up by feel using the ping method.

Didn't pick up a truing stand either. Just mounted the rim in the forks and used some zip ties as fixed points of reference. A stand would be nice though to do this off the floor.




Here's a pic of the stock rim after sitting in the garage a couple days. Came apart on it's own.


-Chris

Last edited by Hman675; 06-05-2014 at 10:46 PM.
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post #20 of 24 (permalink) Old 06-05-2014, 12:44 PM
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tire was holding it together?
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post #21 of 24 (permalink) Old 06-05-2014, 12:53 PM Thread Starter
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I think the spokes were for the most part. In my first post that pic shows the rim right after I removed the tire. The crack didn't begin to expand until after I removed the rim from the spokes. It then continued to grow over the course of several days(maybe a week) and then just separated on it's own.

-Chris
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post #22 of 24 (permalink) Old 06-05-2014, 06:06 PM
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So are you using Strava to track your laptimes at Enduro's

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post #23 of 24 (permalink) Old 06-05-2014, 10:44 PM Thread Starter
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I'm bringing my Garmin this Sunday so I can get some HR readings. Just curious to see what's going on and maybe compare to some of my mtb race files. Remember that one time I raced a mtb?

I'll probably load it up on Strava too just to get some KOMs. Would like to know what that feels like.

-Chris
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post #24 of 24 (permalink) Old 06-05-2014, 11:02 PM
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Don't be a Stravahole

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