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 Post subject: Re: Planet X brakes
PostPosted: Wed Aug 01, 2012 6:07 am 
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Joined: Wed Oct 31, 2007 10:32 pm
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Location: Los Angeles / Glendale, California
I called up Planet-X USA, talked to a friendly guy on the other side of the line.
"Actually, we've never heard of anyone taking these apart. But hey, if you do, let us know what you find" :lol:

I e-mailed Planet-X UK with the same question. No response.
.

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 Post subject: Re: Planet X brakes
PostPosted: Sat Sep 01, 2012 6:32 am 
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Posts: 285
Location: California
Just got some of these. Like the feel (modulation is ok, power is excellent).

I have a couple questions for other users of these:

1) Regarding the centering adjustment. My brakes came with two types of washers, a thicker one and a thinner one. Should I use one or both of them, and where should a place them between the fork and the brake? What has worked for you? I've been using both washers (thinner closest to brake, thicker one against fork/frame), and centering is ok if I also use the side adjust bolt, but I'm wondering if there are better/easier methods for centering in terms of washer placement.

2) Are you torquing the pinch bolt to a certain Nm reading? I don't want to overtighten and smash the cable with the smaller pinch bolt, but I also don't want the cable to slip from an insufficiently tightened bolt. Is hand tightening enough?

:beerchug:

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 Post subject: Re: Planet X brakes
Posted: Sat Sep 01, 2012 6:32 am 


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 Post subject: Re: Planet X brakes
PostPosted: Sun Sep 02, 2012 1:37 am 
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Joined: Sun Jun 17, 2012 3:45 am
Posts: 100
Got a set of these (CNC) today, I am very impressed with the quality.
They look good as well.

1. Swap the stock pads out
2. Careful with the cable clamp. Not enough and it will slip, too much and it will cut through the cable.
Otherwise they are fantastic!
Once I get a few rides on them Ill comment on the power, reliability, and modulation.
Saved over 180g off my 105 calipers!

(Note, the US site has the CNC model on sale right now for about the same price as the forged.)

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 Post subject: Re: Planet X brakes
PostPosted: Sun Sep 02, 2012 4:32 am 
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wojchiech wrote:
Just got some of these. Like the feel (modulation is ok, power is excellent).

I have a couple questions for other users of these:

1) Regarding the centering adjustment. My brakes came with two types of washers, a thicker one and a thinner one. Should I use one or both of them, and where should a place them between the fork and the brake? What has worked for you? I've been using both washers (thinner closest to brake, thicker one against fork/frame), and centering is ok if I also use the side adjust bolt, but I'm wondering if there are better/easier methods for centering in terms of washer placement.

I think the washers are just to give adequate frame clearnce. So I am using 1 washer in the front, and two washers in the rear. I don't think the order or number matters except to give adequate clearance. Use at least one though so it will hold on to the frame at center.

Center the brake as best you can and tighten the fastening bolt, which will cause the serrated washer to "bite" into the frame. Then, use the small adjustment bolt for fine tuning. I also have one of the Park brake adjustment wrenches if I occasionally need a more dramatic recentering (just grab the flats on the main brake bolt and twist it to center.)

Quote:
2) Are you torquing the pinch bolt to a certain Nm reading? I don't want to overtighten and smash the cable with the smaller pinch bolt, but I also don't want the cable to slip from an insufficiently tightened bolt. Is hand tightening enough?


I use a small crescent wrench and a hex key (what is it ? ...2 mm ?) Anyway, the guys who design screws and wrenches are diabolically clever in choosing the diameters and lengths of the hex keys so that the hex key will start to bend an be overstressed-looking at about the right maximum torque on the bolt. So I would say "tighten firmly" but use common sense. I don't measure, but I would guesstimate that it is about 2 N-m. I have never had a problem with loosening or breaking the cable.


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 Post subject: Re: Planet X brakes
PostPosted: Sun Dec 09, 2012 5:14 pm 
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Joined: Thu Feb 24, 2011 6:33 pm
Posts: 285
Location: California
Thanks Rick for the help. I've been riding them for a couple months now and I'm really happy with how they perform.

Another question for owners of these brakes: Are you using 5mm brake housing ferrules with these brakes?

I've been using iLinks with them, and actually had to use one of the shifting ilink cable stops, which are 4mm or less (I don't have size calipers just a guess). Just placing a 5mm ferrule on top of the barrel adjuster and it looks like it is a couple millimeters too big. I would like to switch out the housing, but it is a non-segmented (regular) type of housing and only fits 5mm ferrules.

I emailed Planet-X but have yet to hear from them about this. Thanks for any help. :beerchug:

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 Post subject: Re: Planet X brakes
PostPosted: Sun Dec 09, 2012 6:31 pm 
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Joined: Thu Mar 24, 2011 6:06 pm
Posts: 277
Don't think you will find help from them - I asked them for installation manual and they say that they don't have such a thing. Rear brakes are deliberately set off-centered for me right now as one arm pivots a lot more than the other, so if I centered it the wheel will be pushed off quite badly to the left. Not ideal but I can live with it. Happy with the weight savings still...

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 Post subject: Re: Planet X brakes
PostPosted: Sun Dec 09, 2012 9:30 pm 
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Location: Vicenza
Kayrehn, it reminds me of the old FRM brakes I owned years ago, as the rear brake had to be centered very often before a ride. Not a big problem if you dont mind it.

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 Post subject: Re: Planet X brakes
PostPosted: Mon Dec 10, 2012 1:52 am 
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Joined: Sun Sep 03, 2006 1:55 pm
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Location: Western Australia
wojchiech wrote:
Just placing a 5mm ferrule on top of the barrel adjuster and it looks like it is a couple millimeters too big. I would like to switch out the housing, but it is a non-segmented (regular) type of housing and only fits 5mm ferrules.


I can confirm that 5mm ferrules are too big for the CNC brakes. My brake outer fits snugly in the cable adjuster without even thinking of adding a ferrule.

I have had no centering problems. I'm not sure if this is isolated, but i just adjusted them like I would any standard single pivot brake. Cheap brakes on bikes for children are much harder to deal with.

The performance is great! Like any component, don't look at the static performance. The arm flex is a little offputting but the on road performance is fantastic.

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 Post subject: Re: Planet X brakes
PostPosted: Mon Dec 10, 2012 2:10 am 
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Posts: 296
Location: FL
I just mounted mine up the other day. Very easy to center and install the cable crimp. The stopping power is excellent.


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 Post subject: Re: Planet X brakes
PostPosted: Mon Dec 10, 2012 11:47 am 
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Posts: 292
ahson wrote:
I totally forgot about the barrel adjuster to tighten up the brake gap. :oops: However the lock nut for these calipers are weak and not long enough for my front caliper. The lock nut for the rear is stripped for the allen key, and that will be a problem if I really need to remove them later. Will test how these brakes stop my bike in couple days.

I assume you mean the mounting nut? Mine came with 2 of different lengths. I managed to fit the long one with plenty of engagement. Mine are torx head not allen. Maybe yours are too.

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 Post subject: Re: Planet X brakes
PostPosted: Mon Dec 10, 2012 11:48 am 
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Has anyone figured out a good way to fix Powercordz to these things?

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 Post subject: Re: Planet X brakes
PostPosted: Mon Dec 10, 2012 9:06 pm 
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Location: Los Angeles / Glendale, California
Yeah, just thread it through the nut, do not use the binding screw, and tie a knot on the other side of the nut (self-knot). That's pretty much it.

Getting it to the right length, however, takes some magic. :lol:

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 Post subject: Re: Planet X brakes
PostPosted: Tue Dec 11, 2012 12:58 am 
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Joined: Sun Sep 03, 2006 1:55 pm
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Location: Western Australia
The boss nuts that were included with mine were Torx nuts too. I just checked and a 4mm allen key fit snugly, but that would risk stripping the head.

Likewise the long nut that was included was plenty long enough to fit.

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 Post subject: Re: Planet X brakes
PostPosted: Tue Dec 11, 2012 3:43 pm 
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Joined: Mon Apr 19, 2010 10:33 pm
Posts: 167
I was thinking that bypassing the hole and just wrapping powercordz around the mounting piece, then tying would be better. Eliminates the sharpish edge of the hole.


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 Post subject: Re: Planet X brakes
Posted: Tue Dec 11, 2012 3:43 pm 


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 Post subject: Re: Planet X brakes
PostPosted: Tue Dec 11, 2012 4:09 pm 
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Joined: Thu Feb 24, 2011 6:33 pm
Posts: 285
Location: California
I think the edges of the cam arm are a little sharper, and having the bare powercord knot pulling against it might weaken and eventually fail the cord. Using the cable-nut seems like a better interface for a knot, and with the tension of the cable, the cord won't be sliding against the slightly rough edges of the cable-nut very much.

prendrefeu, how long have you been using powercordz with these brakes? What kind of knot did you use?

Using powercordz with these brakes seems like a better idea than the flawed cable/pinch bolt design.

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