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PostPosted: Wed Jan 16, 2013 8:00 pm 
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Endoism wrote:
Would it pose any dangerous problems to my full carbon Specialized fork? I can see it flexing back and forth a bit under medium braking (That's 'flexing' not rattling due to loose headset :) )


It isn't going to hurt your fork.

A slightly loose headset will not make a rattle... it will just be less stiff than normal. Make sure it is as tight as you can make it without restricting motion.

Is the issue happening only once per wheel revolution, or more often?

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Posted: Wed Jan 16, 2013 8:00 pm 
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PostPosted: Fri Jan 18, 2013 10:43 pm 
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nathanong87 wrote:
u tried ur wife's wheel on ur bike

try your wheel on her bike

Yep, I did that - there was a tiny bit of pulsing/shuddering under brakes, but quite nelagible. Her carbon/alum fork is nearly 200g heavier than my full carbon fork. Perhaps that extra heft adds to it's stiffness

@MileHighMark
That would be a good cheap solution! Nice - ill give that a go before I do anything drastic. Thanks!


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PostPosted: Fri Jan 18, 2013 10:50 pm 
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WMW wrote:
Endoism wrote:
Would it pose any dangerous problems to my full carbon Specialized fork? I can see it flexing back and forth a bit under medium braking (That's 'flexing' not rattling due to loose headset :) )


It isn't going to hurt your fork.

A slightly loose headset will not make a rattle... it will just be less stiff than normal. Make sure it is as tight as you can make it without restricting motion.

Is the issue happening only once per wheel revolution, or more often?


Cool, I rechecked and re-preloaded the headset bearings - still pulses.
I can't ascertain it's pulse frequency - it only pulses at higher speeds, so it's difficult to perceive. I'll see if I can grab an old tyre, paint a nice large bright reference mark in one spot and do some trial runs....

What were your thoughts to to the pulsing frequency?


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PostPosted: Sun Jan 20, 2013 4:48 am 
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Endoism wrote:
I can't ascertain it's pulse frequency - it only pulses at higher speeds, so it's difficult to perceive.


If the pulsing is due to the brake track being uneven in width in one spot (usually at the joint) it will be very noticeable at low speeds. Try it on a steep downhill while going slow.

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PostPosted: Sun Jan 20, 2013 5:48 am 
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I had this same problem with a set of 7801 wheels I bought off ebay (now we know why he sold them). Both the front and read pulsed and I tried sanding the rims, etc. I finally decided that it was a variation in the hardness of the brake track. I found a new front rim on ebay that I guy bought for a project and never even laced it up. I relaced the front and it was fine. The rear pulsed less than the front and I just live with it. The wheelset has several thousand miles and the rear still pulses.

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PostPosted: Sun Jan 20, 2013 6:47 am 
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Double check that you don't have something sticky like Coke (dried) on the rim.....Wash it with lots of water and a few drops of detergent. BTW....Kinlin rims are Scandium enhanced, aren't they??...Cool stop SALMONS dude!!! (NOT Black!)....these pads (salmons) look after your rim. After you've tried water as your solvent, If this doesn't work, try a non-polar solvent (Benzene, thinners etc) and see if there is any difference.
Don't laugh re the coke....I had a mate who darn near killed himself with a sticky front rim......it took us ages to figure it out!! the rim looked (and felt) absolutely normal when having a look at it.

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PostPosted: Sun Jan 20, 2013 3:37 pm 
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I think the 7801 rims were scandium enhanced also. I even wet sanded mine with a diamond whetstone (from my ski tuning tools) and there was no change. I wonder if scandium has issues with this?

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PostPosted: Sun Jan 20, 2013 10:16 pm 
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theremery wrote:
Kinlin rims are Scandium enhanced, aren't they??


Niobium.

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PostPosted: Wed Jan 23, 2013 12:21 pm 
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WMW wrote:
Endoism wrote:
I can't ascertain it's pulse frequency - it only pulses at higher speeds, so it's difficult to perceive.


If the pulsing is due to the brake track being uneven in width in one spot (usually at the joint) it will be very noticeable at low speeds. Try it on a steep downhill while going slow.


I think the pulsing is occurring more than once per revolution and decreases in severity when I'm going less than, say, 10kph...

The pinned joint is actually very very smooth without any sharp edges, so I'm pretty sure that's not the cause...


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PostPosted: Wed Jan 23, 2013 12:27 pm 
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WMW wrote:
theremery wrote:
Kinlin rims are Scandium enhanced, aren't they??


Niobium.

Reckon I should still use Salmon pads?

Another update, I swapped with a mate's Ksyrium Elite front wheel, did a few Kim's and a variety of stopping pressures: nice and smoooooth... My mate also reported that there was a bit of pulsing from his Speedvagen ( with my front rim), but definitely not as severe as when he rode my bike with the shitty rim. So it sounds like that the full-carbon Specialized fork that I'm running, is also a bit flexy....


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PostPosted: Wed Jan 23, 2013 12:44 pm 
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I didn't have great joy with Koolstop Salmon, on American Classic rims though. Plain black Swiss or Shimano pads are a good baseline, if they don't work, Salmon won't do any magic, as far as I experienced. Doubt the choice of pad will affect the shuddering much, in any case.

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PostPosted: Wed Jan 23, 2013 1:12 pm 
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I'd be happy if I could source AC 420 rims by themselves... I've had a set before and they weren't too bad...


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PostPosted: Wed Jan 23, 2013 1:43 pm 
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Agreed regarding the AC420s, but there are lots of interesting (wider) alternatives these days.

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PostPosted: Wed Jan 23, 2013 4:21 pm 
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Salmon pads are recommended for Kinlin rims.

Have you thoroughly cleaned your rim and pads?

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PostPosted: Wed Jan 30, 2013 12:44 pm 
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WMW wrote:
Salmon pads are recommended for Kinlin rims.

Have you thoroughly cleaned your rim and pads?


I cleaned my rims (hot water and Meguires car wash) and gave the brake pads a bit of a scuffing with some 100-grit and it alleviated the pulsing a little, but it's definitely still there. I've got a set of salmon pads coming soon - hopefully that'll help a little more...

As long as my full-carbon Specialized fork isn't going to snap on my and send my front teeth into the road, I'm relatively happy in just tolerating the pulsing since I like my White Industries hubs so much.. If worse comes to worse after a trial ride of Hotham at the end of Feb in preparation of 3 Peaks, I'll borrow a mate's Ksyrium wheel..

Really wish I had read more reviews regarding Kinlin rims BEFORE I bought them....


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Posted: Wed Jan 30, 2013 12:44 pm 
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