[Closed] Brake mount advice

Why on earth do you need a 180 rear rotor with an M4. Do you overheat the brake? Thats the only reason I can think of If it is working properly you will have plenty of power on a 160 disc.

Because i'm a fat bastard and it locks up quickly. Do you know the answer or not?

At a guess a std +20mm mount should do the trick.
Run 180s on mine, gives a bit more power when you need it.

Bigger rotor / increased power will lock it more quickly surely?

You need a "B" adaptor for a 183mm disc on the rear.

Oh and TJ a very good reason I've found for using a 183 on the rear instead of a 160 is because it's more powerfull. 🙄

EDIT.

For all you Hope adaptor needs.

[url] http://www.hopetech.com/database/HOPE%20STEP%20UP%20MOUNTS.pdf [/url]

Once again TJ highlights the facts. If it locks up you need less power not more so a smaller rotor would be better.

Cheers guys for the helpful input. Tandem Man, if you've nothing decent to add why bother?

Maybe I wasn't as polite as I could have been but note chainslapps post.

Or if you need more power then your brake might not be working properly and I thought I might be able to help with that.

Get the bigger disc if you want but you will have less modulation and more likelihood of locking IMO

if you need more power then your brake might not be working properly

Or you might be fatter/faster/ride different terrain/brake later.

As I side note I've had to replace a couple of 160 floating Hope rotors after the rivets got very loose. This doesn't happen with the 183 rotors.

Bigger rotor = more power, which will lock brakes sooner.

I get away with a 180 front and a 140 rear (Formula B4s). More than enough power for my weight & style of riding.

Singlespeedstu - the OP wants a brake that locks less easily. An M4 on a 185 disc will lock the rear on the tandem at high speed

If he rides faster or brakes later or is a heavier weight rider, then the brake would not "lock up quickly" as the OP states it would not lock at all or feel unresponsive. In that case you would need a more powerful set up to compensate, so once again TJ was pointing out fact to try and assist with the issue.
Also late braking puts the weight of the rider forward and makes the back lighter which can cause the wheel to loose traction, which could be the cause of the problem.

Yep, 'B'adapter, M4s with 183 rotors front and rear work perfectly on my 5 Spot. Great combination of modulation and power.

An M4 on a 185 disc will lock the rear on the tandem at high speed

Not on ours it wouldn't.

Chainslapp.
You seem to be talking in circles.

I was talking about [b] my[/b] reasons for wanting a 183 rotor on the rear.

Anyway the OP now has the info he [b]asked for[/b].

Anything else is unimportant.

Brake discs are circular so thanks for pointing out the obvious. And apologies for having an opinion as you know it all.

If your M4 would not lock the rear on your tandem at speed than it was not working properly

Chainslapp.

Yes your entitled to your opinion.
Just the same as I am. The difference is I'm not upset my other opinions....

If your M4 would not lock the rear on your tandem at speed than it was not working properly

And you know all that from where your sat.

Without seeing the setup/ bike riders/ hill. Man you're good.

You not got anyone else to argue with tonight then? 😉

Loving your work TJ

Ta al Did you notice the missing of the point by half the posters on the thread?

Yes Stu 'cos I know how powerful a correctly functioning M4 is.

Im certainly not upset by your opinions, just the way you deliver them and the condescending manner you have. 😆

No I got pretty bored if I'm honest.

Yes Stu 'cos I know how powerful a correctly functioning M4 is.

I think that says more about the speed you ride at than anything else.

Give Hope a call and ask them what they recomend for tandem use.

It sure as hell wont be an M4 with a 183 rotor.

As I side note I've had to replace a couple of 160 floating Hope rotors after the rivets got very loose. This doesn't happen with the 183 rotors

Can anyone else confirm this? I've had the same issue with my Hope 160's and was going to go back to non-floating next time one gets too wobbly. Always feels like I've a loose headset or something due to the loosening rivets. Not sure I want 180's though...

Just woken up to find an unbelievable amount of posts on what i thought was a simple question. Thanks for everyones input (even TJ's even though he was a little rude)
Maybe if i'd said one of the reasons for wanting a 180 rotor is that i'm going to the alps this year it wouldn't have caused as much concern.

Thanks again, a [b]'B' adaptor [/b]is on its way.

I think TJ had a point that he's managed to obscure in the general name calling;

If your 160mm brake 'locks up' then fitting a bigger disk won't help - you need to look at how you brake. If you want a bigger disk for other reasons (like better heat dissipation on a trip to the alps) then it's different.

singlespeedstu - Member

I think that says more about the speed you ride at than anything else.

Ia it easier to lock up your back wheel at low speeds? I'd have thought the reverse.