IS or Post Mount - What is mine?

beardwithabike

Im a bit confused about this. What are mine? An explanation would be wicked too

Front:



Back:

nicklouse

post front, IS rear.

beardwithabike

nice one :]

beardwithabike

will these fit? Im guessing i need an 'adapter' but i want someone to clarify this as they are 70 quid

http://cgi.ebay.co.uk/ws/eBayISAPI.dll? ... :IT&ih=001

BlackSpur

If you get the right adaptor then yes. You can get LX (the next level up) for less if you include postage - plus it's from a proper shop so no scam risks.
http://www.merlincycles.co.uk/?fn=product&productId=15&categoryId=115

beardwithabike

oh my god i looked there i hadnt seen them!!

*Buys now*

Thankyou :]

Any idea on the right adapter?

Its a front Manitou fork and i assume thats standard accross the range

BlackSpur

From the sounds of the description it comes with adaptors

LX calipers with IS brakes 160mm front and rear , will also fit 160mm post mount front.

Either wait until they arrive or give Merlin a call tomorrow and ask them.

beardwithabike

will i have a problem with the rotor fit?

Ie The central Lock mechanism

nicklouse

depends on what you actually ordered.

beardwithabike

well if it was the link above

ie this one

http://www.merlincycles.co.uk/?fn=produ ... goryId=115

will they go straight on to my bike or will i have a problem with the shimano central lock mechanism .... ive not heard of this? I thought its just 6 bolts

nicklouse

new discs.

beardwithabike

One last question. If my front disc is 180 and my rear 160 now .... do my new discs have to be that diameter too regardless of make?

synchronicity

It looks like you have an 8" post mount fork, not a 6" one... if that's the case it would be hard (impossible?) to find an adapter to go back to smaller discs (smaller than 8") on the front. Or you can even go up to 9", but really & truly, that is overkill for most places.

For the rear, you can get 6", 7" or 8", but you'll need different adapters for the last two.

Measure the distance between posts to be sure... but I tell you now, most (if not all?) brake calipers running 8" discs on a 6" post mount fork need an adapter to run it (unless of course it's the DH specific 8" post mount). Yours doesn't have an adapter... so are you positive that's an 8" disc? :?

nicklouse

your front disc should be 160mm.

But what is the model and year of the manitou fork.

synchronicity

This should provide a better explanation of the different types of disc brake mounts:
http://www.bikeradar.com/road/forums/vi ... ?t=1590919

beardwithabike

ok so after creeping through the house to the garage i have measured this ....




I just want to buy a brake set for under £100 with or without the right adapters as my julies are knackered. Im getting confused with mounts, adapters, post sizes and rotor sizes

nicklouse

again what is the fork and year.

but just buy the LX and fit with your current rotors.

beardwithabike

i believe it is a Manitou Six Sport 80mm (2003)

nicklouse

so the mount is a post 6" Now if your disc IS 180mm then you must have a spacer between the caliper and the fork mount use this with the new post mount brakes and the current disc. or remove the spacer and use with 160mm disc.

beardwithabike

well i can guarantee the diameter is 180mm and there is no spacer between the fork and caliper The didtance between the bolts is 3 inches. Im mega confused now from your last post as the rotor IS 180mm and theres no spacer

I appreciate the help btw

beardwithabike

PS Is the fact the mount is backed off from the fork the reason it accomodates a 180mm?

nicklouse

the fork is 6" post mount. and IF the disc is 180mm there has to be a spacer.

and if you follow the link posted above to my post on mounts and scroll down you will find the drawings for the mounts.

PS Is the fact the mount is backed off from the fork the reason it accomodates a 180mm?

what do you mean?

nicklouse

an example of adaptors for post 160 to 180mm



they are just spacers.

beardwithabike

well i measured the disc right accross the middle and it was 180mm. And surely if there was a 20mm spacer you could see it in the picture.

The PS that i wrote, i meant that where the bolts go into the fork, that bit is not flush on the fork, it is set back towards the back of the bike, like raised off

beardwithabike

wouldnt u see them in the pic i posted of my front fork?

beardwithabike

the first picture shows the post mount within the fork. My fork has circled where the post mount would be if it was the first picture but the arrow shows how its set back. This is what i meant by maybe thats why it accomodates a 180mm rotar disc with no spacers

nicklouse

so you are saying that there is air between the calliper and the fork? so the calliper is lose?

why are you posting a picture of a cable tie off point? it has nothing to do with the fitting of the brake.

the spacer is only 10mm! and from the angle of your picture not really.

beardwithabike

balls to it, il take a zillion pictures tomorrow from every angle to clarify any argument

nicklouse

just one clear picture from the side. is all that is needed.

synchronicity

Sorry I realised that 180mm is a 7" disc, not an 8" one. I always make that mistake, 'cause 7" discs are rarely seen here.

Take the wheel off to measure the disc diameter more accurately. Personally, I would take it to a bike shop. Then if you buy anything, and THEY get the sizing wrong, you'll get a refund or at least a component swap.

Another thing... aren't the 6" + 8" post mounts the same distance apart? It's just their position or height on the fork that makes them work with 200mm+ rotors. Sorry for the confusion... :oops:

nicklouse

synchronicity wrote:

Another thing... aren't the 6" + 8" post mounts the same distance apart? It's just their position or height on the fork that makes them work with 200mm+ rotors. Sorry for the confusion... :oops:

6" and 8" post mounts are the same except for the distance from the axel and the caliper just bolts on.

But a Manitou 80mm travel 2003 XC fork does not have a 8" post mount.