On one Parkwood rear disc help please !!

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  • On one Parkwood rear disc help please !!
  • Unless you want to start filing the disc mounts, I’d suggest getting a 180 rotor and calliper mount, and file that down a bit.

    renton
    Member

    I was wondering if it was a 180mm disc thats meant to be fitted?

    It looks like its missing around a cm of the disc all round.

    Premier Icon Northwind
    Subscriber

    Some bikes with stupid rear postmount have stupid minimum 180mm rotors, looks like it may be one. First hardtail I’ve seen like that though…

    renton
    Member

    Weird isnt it!

    Premier Icon faustus
    Subscriber

    Pretty sure they’re not for 180mm discs, and the rear on my parkwood has never been a problem. Also, in the pic the rotor seems to fit in the caliper correctly, so might it not just need a bit more bedding in?

    I used those rotors on my road bike and noticed a similar thing, I think they need a tad longer to bed in and then they’re fine. I don’t remember having such a warbling problem, that might just be alignment?

    The other thing is to check it’s seated all the way in the dropout, i have to do a little shuffle to check this on mine..?

    andyl
    Member

    Looking at the wear on the disc you are about 4-5mm out. I fear that looks like the brake tabs are not right.

    jb72
    Member

    Does the friction material on the pad match the extent of the wear we can see on the disk? As has been said – does it just need bedding in?

    A picture from behind would help.

    renton
    Member

    This shows the difference between front and rear hopefully…

    Front …

    Rear….

    The rear disc sits a bit lower between the pads.

    Premier Icon faustus
    Subscriber

    Strange – it looks less than the difference between a 160/180 disc. Tried loosening the QR and slightly splaying the non-drive side against the hub to check it’s fully home in the dropout? I know it’s patronisingly obvious but mine is susceptible to this…

    Premier Icon dday
    Subscriber

    That is odd. Daft question but I’ll ask it anyway – those calibers are not front / rear specific are they?

    renton
    Member

    Ive finally finished building this up and put a 160mm rear disc on the back as per what it would come with from On one.

    However , the bloody thing is warbling like mad.

    On closer inspection it looks like the pads are only hitting part of the disc……….

    The brake is a standard deore model and the disc is a budget shimano one.

    Any ideas what is going on here??

    renton
    Member

    Its not patronizing at all. I’ve been out and checked the hub is sat correctly in the dropouts.

    I’m pretty sure a caliper is a caliper in that they are front or rear specific.

    Its got me baffled.

    Premier Icon bigjim
    Subscriber

    my Parkwood has a lot of paint on the dropouts and when you think the wheel is in properly it’s actually only half in, I suspect you can get it in another few mm yet

    Premier Icon faustus
    Subscriber

    This is true – i had mine powdercoated and had to sand off a fair bit of paint on the inside of the dropouts to enable me to fit a 10mm rear thru axle…sand the inside top of the dropout if if has lots of paint accumulated??

    Premier Icon faustus
    Subscriber

    Oops double post!

    renton
    Member

    I should point out that the frame was used and the previous owner didn’t say anything about braking problems.

    Ice just been out and done 10 miles to try and bed the brake in and its just shit.

    No power and really spongy.

    What can I do ?

    Premier Icon bigjim
    Subscriber

    I’ve got 20 dirhams on you not having the wheel all the way into the frame.

    Also those rotors say resin pads only, are those sintered pads?

    coppice
    Member

    That wont bed in. My 45650b needed the dropouts filing from new

    renton
    Member

    It’s definitely seated in the frame correctly…..

    Premier Icon bigjim
    Subscriber

    I also have deores on my parkwood so I’ll have a look later or tomorrow night. I’m sure I’m getting proper tracking on mine, but I did have weirdness trying to fit an adapter to run a 180 rotor, it had the same result as you have there, which is odd and I’ve never seen it before.

    dvatcmark
    Member

    There is a rotor compatibility chart on shimanos website, have a look as you might find that caliper is not compatible with that rotor.

    Edit it’s towards the bottom of this
    thread

    http://singletrackworld.com/forum/topic/disc-brake-pads-too-low-will-i-die-after-sticking-some-washers-under-caliper

    It’s not a 150 rotor or something daft? Shimano did used to to 150/160/170/180 to allow for some of the weirder setups (trying to run IS calipers on a post mount frame being top of the list and requiring a 10mm addapter).

    renton
    Member

    Nah it’s definitely a 160mm disc.

    Suggsey
    Member

    Have you got a 180 disc laying about somewhere or cut one out of card just to see as I think that’s all it needs…..

    renton
    Member

    I could take the front one off and try it.

    mattyfez
    Member

    Are the disks true? Lay them on a flat surface.. Just eente thought

    Premier Icon scotroutes
    Subscriber

    And it is definitely a 160 rotor? You’ve measured it?

    Premier Icon dudeofdoom
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    Great 🙂 currently got the same frame in the stand waiting for 180 disc to arrive.

    I have a feeling there’s a v2 version of the frame and I’m wondering if it’s a 180 post as standard instead of 160 ..

    I think v2 got a 30.9 seat post

    Pity we can’t do the incantation anymore ;-(

    renton
    Member

    I’m sure this is the v1 with the 31.6mm seat post.

    brant
    Member

    Pity we can’t do the incantation anymore ;-(

    Yes

    renton
    Member

    Hello Brant !!!

    Any ideas what’s going on here please.

    m0rk
    Member

    Hello Brant !!!

    Any ideas what’s going on here please.

    That’s now how it works…..

    andyl
    Member

    probably easiest to fit a 180 rotor and some washers to space it up. Looks like the upper mount is the one that is wrong.

    Premier Icon Northwind
    Subscriber

    renton – Member

    Any ideas what’s going on here please.

    Apparently something is the wrong size.

    Well, someone had to say it! Trying it with your 180 rotor is the next step as suggsey said, no point thinking about it more til you’ve done that. With no adaptor. If that doesn’t work either then it’s Legendary On One Build Quality.

    renton
    Member

    Aye, I will swap the rotors around tomorrow see what’s happening.

    renton
    Member

    Ok so I’ve just tried a 180mm disc and that doesn’t fit.

    It’s much to big.

    I’ve got another 160mm disc on the way to try.

    coppice
    Member

    Ask On-One?

    180 disc and washers is looking the best option

    Premier Icon superstu
    Subscriber

    My brother has a parkwood with deore’s I’ll try and ask him about his set up to see if that helps

    Try digging out the “standard” dimensions for post mount. Sure i’ve seen them somewhere before. Measure them up.

    Then if its the posts that are wrong, get them faced (lots).

    The last owner may have simply not noticed, or cared, that they were wrong.

    Premier Icon bigjim
    Subscriber

    I’ve got another 160mm disc on the way to try.

    A ruler or measuring tape would probably be cheaper.

    I’ll have a look at mine tonight anyway.

    I doubt the post mounts are out by any significant amount, looks like a one piece cast/forged part with the dropout.

    Ask On-One, and if you don’t have any joy I’ll look at my fatty (which is also 160mm and IIRC shares the same dropout).

    renton
    Member

    A ruler or measuring tape would probably be cheaper.

    I’ll have a look at mine tonight anyway.

    Sorry what I meant is that I think the disc I have isnt compatible with the caliper.

    Its an rt54 alivio disc.

    Premier Icon Northwind
    Subscriber

    The cheaper discs are made out of monkey metal so they’re not recommended with sintered pads but the radiuseseses should be the same.

    (OK, like a lot of people I think, I found out about the sintered pads thing after using one of the discs for about a year- it seemed fine, I’ve had faster wearing discs)

    http://roweroweporady.pl/pobierz/shimano-compatibility.pdf page 25?

    BR-M615 is not listed as compatible with the RT54, if that is what you are using. (But that might just be the pad material)

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