Kettle Cycles Carbon Rotors

Discuss light weight issues concerning mountain bikes & parts.

Moderator: Moderator Team

Post Reply
lordconqueror
Posts: 171
Joined: Thu Jul 17, 2008 9:37 pm

by lordconqueror

If you guys haven't already, there is a massive thread about these rotors over at MTBR, in the Brake forum. The issue of the out-of-true rotor has even come up, and in the case of that specific poster, they didn't have the rotor mounted up perfectly, which caused it to rub at one point on its rotation.

by Weenie


User avatar
ms6073
Posts: 2393
Joined: Fri Jul 23, 2004 8:24 pm
Location: Houston, Texas

by ms6073

lordconqueror wrote:The issue of the out-of-true rotor has even come up, and in the case of that specific poster, they didn't have the rotor mounted up perfectly, which caused it to rub at one point on its rotation.
I have already removed/remounted the rotor prior to my previous post and that did not resolve the issue. Just perused the last few pages of that thread, starting with were folks started receiving rotors and did not see any other posts about rotors being out of true.
Michael - The Anaerobic Threshold is neither...

lordconqueror
Posts: 171
Joined: Thu Jul 17, 2008 9:37 pm

by lordconqueror

lame. i guess it's time for you to fill out the online customer service request form they are so insistent on people using, so they can get you sorted.

User avatar
ms6073
Posts: 2393
Joined: Fri Jul 23, 2004 8:24 pm
Location: Houston, Texas

by ms6073

Actually I see that as being very customer oriented. So this morning again removed the rotor but this time laid it flat on a granite countertop which indicated the rotor was within +/-2mm of laying flat along the brake track. I also placed the wheel in the truing stand (budget model for basic truing), and using a micrometer, was able to make some adhoc checks for hi/lo variation on the face of each of the rotor disc mounts. I did this by placing the micrometer flush against the arm of the stand and measuring the differences between each of the 6-mounts which varied from as little as .05mm to possibly as much as .50mm. This seems like a very small degree of variation but since it is near the center of the rotors rotation, I am guessing that the lateral variance would be amplified further out along the surface of the rotor. At this point, I am thinking I might need to check with a local machine shop than turned the flanges off my hollowgram spindles to see if they also mill the hub's disc mount faces to much tighter tolerances.
Michael - The Anaerobic Threshold is neither...

CGT
Posts: 397
Joined: Fri Jan 05, 2007 5:33 pm
Location: Stockholm, Sweden

by CGT

If you have the same rotor sizes front and rear, a simple swap of rotors would reveal if one of them is out of true or if the problem lies with the rear hub...

User avatar
dwaharvey
Posts: 493
Joined: Thu Oct 26, 2006 8:54 pm
Location: USA

by dwaharvey

Or rotate the rotor on the hub by a couple of bolt holes and see if the high / low spots follow the rotor or stay with the wheel...

02GF74
Posts: 570
Joined: Thu Jan 13, 2011 4:04 pm
Location: Sunny UK

by 02GF74

ms6073 wrote:Actually I see that as being very customer oriented. So this morning again removed the rotor but this time laid it flat on a granite countertop which indicated the rotor was within +/-2mm of laying flat along the brake track.


not sure of the whole story but +/- 2 mm runout is far too much. any rotor I have that is fitted to my wheels is well within within 0.5 mm, or +/- 0.25mm (haven't measure any but just by looking)

User avatar
stephen@fibre-lyte
in the industry
Posts: 605
Joined: Thu May 29, 2008 12:22 am
Contact:

by stephen@fibre-lyte

That's what I was thinking. 2mm is an awful lot for a brake track to be out, especially on something so small. Is it 2mm extra thickness or is it the same thickness all over but out of flat by 2mm?

skyfire1202
Posts: 214
Joined: Wed Apr 16, 2008 7:43 am
Location: Sapporo City, Hokkaido, Japan
Contact:

by skyfire1202

Anybody using/used these rotors on Formula R1? Seems like a very tight fit into the calipers.

ricerocket
Posts: 502
Joined: Mon Sep 27, 2010 8:38 am

by ricerocket

Any comments on the brittle-ness of the rotor? On cars, rotors are pretty shielded. On MTBs, they're sort of out there in the wind.

UpFromOne
Posts: 684
Joined: Wed Apr 08, 2009 5:23 am
Location: Olympic Nat'l Park, WA

by UpFromOne

I took delivery of mine (a 160 SFL), and then decided to stick with my Scrubs. I listed it for sale hedre, but no one bought it. So I decided to have a go at it, and mounted it up. Dead-on true mine is. no wobbles. still in the process of properly breaking it in, so i'll report later on its maximum abilities.

Erhar
Posts: 47
Joined: Wed May 02, 2012 7:22 pm

by Erhar

What do you mean, "Dead-on true mine is "? That it has bad or no breaking performance?

CGT
Posts: 397
Joined: Fri Jan 05, 2007 5:33 pm
Location: Stockholm, Sweden

by CGT

Erhar wrote:What do you mean, "Dead-on true mine is "? That it has bad or no breaking performance?

That it is straight.

UpFromOne
Posts: 684
Joined: Wed Apr 08, 2009 5:23 am
Location: Olympic Nat'l Park, WA

by UpFromOne

LOL, thx for interpreting!
Yes, straight as can be. When the pads just begin touching the rotor, it's a constant sound.

Gabe
Posts: 56
Joined: Tue Jan 24, 2012 9:16 pm

by Gabe

ehh, just wait till the places in china that make the $500 carbon frames start making these things for $30 bucks. Kettle Cycles has no rep anyway so who cares.

by Weenie


Post Reply
  • Similar Topics
    Replies
    Views
    Last post