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Stupid disc brake I...
 

[Closed] Stupid disc brake IS/Post mount question

 IHN
Posts: 20190
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Topic starter
 
[#4286139]

Not for me, you understand, for my friend.

If he has a BB7 brake caliper like this:

[img] [/img]

is he right in thinking that it doesn't matter whether the fork he's mounting it to has an IS or a Post mount 'tab'? Or is he being thick?


 
Posted : 22/08/2012 9:09 am
 nbt
Posts: 12521
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If you - sorry, "he" - remove the IS to Post adapter, you can mount the brake directly to post mount forks. Leave the washers in place, but use a 20mm smaller rotor...


 
Posted : 22/08/2012 9:10 am
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Pretty much all calipers are PM but forks are either PM or IS. The adaptor also has to be the right size for the rotor


 
Posted : 22/08/2012 9:12 am
Posts: 251
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[i] but use a 20mm smaller rotor[/i]

unless the PM mounts on the fork are set for a 180mm rotor, not the 160mm IS standard.


 
Posted : 22/08/2012 9:12 am
 IHN
Posts: 20190
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Topic starter
 

Ah, okay, so if [b]he[/b] wants to use the same (160mm) rotor, then he'll need to buy an adaptor?

{edit} of course, the rotor on the picture is 180mm, so 160mm would be 20mm less than that, so it would work. He really is a bit of a thicko, ahem.


 
Posted : 22/08/2012 9:13 am
 nbt
Posts: 12521
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unless the PM mounts on the fork are set for a 180mm rotor, not the 160mm IS standard.

Be a bloody stupid fork manufacturer who mandated a 180mm minimum rotor but yes, your point is valid

He really is a bit of a thicko, ahem.

Yes, well, give him a slap then and tell him he owes me a pint 😉


 
Posted : 22/08/2012 9:18 am