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 Post subject: KINLIN XR31 flex?
PostPosted: Fri Jul 08, 2016 1:08 am 
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Joined: Sun Jun 10, 2012 1:11 am
Posts: 848
i have a set i'm running the following wheelset on my 2015 TMR02:

Kinlin XR31T/31RT 20/24H
Spoke:CN Aero424
Hub: Bitex F13/R13

last couple rides on climbs where i go out of saddle to pedal, i noticed the wheel rubs against the rear brake pads.

i'm wondering if the tension is not stiff or is the rim itself not very stiff?

i check the pad and it seems to have 2-3mm of gap, which should be enough.

anyone else have used this before?


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 Post subject: Re: KINLIN XR31 flex?
PostPosted: Fri Jul 08, 2016 11:40 am 
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in the industry

Joined: Sat May 12, 2012 7:25 pm
Posts: 2573
Location: Glermsford, Suffolk U.K
The rim is exceptionally stiff. Build with them alot and no one has complained of this. If your wheel is properly tensioned it will not flex by any noticeable ammount.

It is not possible to tell the difference between the wheel flex and frame flex when riding. Given the wheels may be stiffer than your rear triangle you may be suffering from wheels to stiff for the frame or a seriously undertensioned wheel. Also tight fitting tyres do drop the tension by quite a bit.

When you place a rear on a block of wood and press down on the rim there is no give at all.

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 Post subject: Re: KINLIN XR31 flex?
PostPosted: Fri Jul 08, 2016 2:05 pm 
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Joined: Sun May 16, 2010 7:28 pm
Posts: 822
There's a slow twitch post on this somewhere

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 Post subject: Re: KINLIN XR31 flex?
PostPosted: Fri Jul 08, 2016 7:13 pm 
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Joined: Sun Jun 10, 2012 1:11 am
Posts: 848
bm0p700f: "Also tight fitting tyres do drop the tension by quite a bit." now that you mentioned it.. its currently mounted with Conti GP4KII - 23mm and it was a PITA to put on. it was extremely tight.. so that might cause the tension drop. maybe i should change a different tire to see.

i heard this rim support tubeless and i'm currently using the GP4KII with inner tubes.

any tire you'd recommend that won't be so tight on the rim?

also, what's the spoke tension you would suggest in my setup with the bitex hub? i'm 66.7Kg.

kulivontot: do you have the link for slowtwitch? i'm not a member there.. but would like to see what others have mentioned about this rim.


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 Post subject: Re: KINLIN XR31 flex?
PostPosted: Fri Jul 08, 2016 9:31 pm 
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Joined: Mon Feb 19, 2007 7:26 am
Posts: 1999
Location: Atlanta, GA, US
It is not how tight a tire fits that dictates the tension drop. Once a tire is on the rim, it is on the rim; changing tires won't change anything from a tension drop perspective. What would help is to run a lower pressure, which you could do if you ran a wider tire.

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 Post subject: Re: KINLIN XR31 flex?
PostPosted: Sat Jul 09, 2016 12:33 am 
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Joined: Sun Jun 10, 2012 1:11 am
Posts: 848
with my 23c.. i run 100psi.. can i run 90psi and no risk getting pinch flats or others?


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 Post subject: Re: KINLIN XR31 flex?
PostPosted: Sat Jul 09, 2016 1:45 am 
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Joined: Sun May 16, 2010 7:28 pm
Posts: 822
http://www.slowtwitch.com/Tech/Debunkin ... _3449.html

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PostPosted: Sat Jul 09, 2016 3:04 am 
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Posts: 1999
Location: Atlanta, GA, US
addictR1 wrote:
with my 23c.. i run 100psi.. can i run 90psi and no risk getting pinch flats or others?

How much do you weigh?

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 Post subject: Re: KINLIN XR31 flex?
PostPosted: Sat Jul 09, 2016 3:08 am 
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Joined: Sun Jun 10, 2012 1:11 am
Posts: 848
66.7kg


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 Post subject: Re: KINLIN XR31 flex?
PostPosted: Sat Jul 09, 2016 3:53 am 
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Joined: Mon Feb 19, 2007 7:26 am
Posts: 1999
Location: Atlanta, GA, US
Yeah, you can 90 psi no problem at that weight, probably even less (75-80) with the wide rims.

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 Post subject: Re: KINLIN XR31 flex?
PostPosted: Sat Jul 09, 2016 4:05 am 
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Joined: Sun Jun 10, 2012 1:11 am
Posts: 848
fa63 wrote:
Yeah, you can 90 psi no problem at that weight, probably even less (75-80) with the wide rims.


i checked the spec.. the rim inner width is 19mm and outter is 21mm.


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 Post subject: Re: KINLIN XR31 flex?
PostPosted: Sat Jul 09, 2016 11:36 am 
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Joined: Mon Feb 19, 2007 7:26 am
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Location: Atlanta, GA, US
I remember that rim being 19 mm inner / 24 mm outer. The inner width dictates the actual size of the tire, and 19 is pretty wide. I bet your 23 mm tires end up closer to 26 mm once mounted on those rims.

Anyways, all of that said, not sure if lowering the tire pressure will solve your issue. As suggested previously, a stiffer rim deflects MORE at the brake pads than a less stiff one so spoke tension might not be the issue here.

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Last edited by fa63 on Sat Jul 09, 2016 11:59 am, edited 1 time in total.

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 Post subject: Re: KINLIN XR31 flex?
PostPosted: Sat Jul 09, 2016 11:52 am 
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in the industry

Joined: Fri Apr 29, 2011 8:32 pm
Posts: 114
Consider opening your brake shoes a few millimeters.

I have this same rim (good choice!), built with thin CX Rays to a reasonable ~120kgf on a steeply dished 11s Powertap hub. I weigh 180 pounds and notice no flex.

But everything flexes, more or less. Frames, wheels, everything.

So I just open the brake shoes a few more millimeters and enjoy the ride!

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 Post subject: Re: KINLIN XR31 flex?
PostPosted: Sat Jul 09, 2016 4:29 pm 
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Joined: Tue Feb 24, 2009 11:43 pm
Posts: 630
Location: Florida
^ I was ready to suggest opening up the pads a bit more as I feel it improves modulation as well with a little more cable in the lever action.

And then there is the whole climb in the saddle thing. I used to climb out of saddle more than I do know but I'm more efficient in the saddle and my heart rate does not spike. I usually only climb out of saddle just before cresting the top.


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 Post subject: Re: KINLIN XR31 flex?
PostPosted: Sat Jul 09, 2016 6:52 pm 
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Joined: Sun Jun 10, 2012 1:11 am
Posts: 848
Thanks guys. Damon, I did just that... Now it's like 2-3mm on each side. I'm using Swiss stop salmon so it's kinda curved at the edges. What other pads will be good for this rim?


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