Deore M615 still a recommended disc brake?

nandystam
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Deore M615 still a recommended disc brake?

Postby nandystam » Mon Jun 19, 2017 3:43 pm

Looking to upgrade the Tektro HDC-300s on my flat bar roadie, and from what I recall the Deore M615 was highly recommended without being too costly.

Is that still a good recommendation or are there better options available in the same price range?

Thanks

Calvin27
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Re: Deore M615 still a recommended disc brake?

Postby Calvin27 » Mon Jun 19, 2017 4:30 pm

I went through this recently (also had HDC300) and yes they are still the budget go to for me. In fact I've noticed that shimano has probably realised they made it too much value and they are selling for abou $140 a pari as opposed to $100 a year or so ago. SLX and XT seems to have stayed the same price.
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nickdos
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Re: Deore M615 still a recommended disc brake?

Postby nickdos » Mon Jun 19, 2017 4:51 pm

They are great brakes for the money and still come stock on many $3000+ bikes. If you're after something even cheaper, then try and find the next level down, the Shimano Acera M396. I bought a pair last year for $72 (CRC - not including rotors). These will be more than adequate for commuting/city cycling, as I fitted them to my son's mountain bike and they work really well (gave them a good testing myself).

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Re: Deore M615 still a recommended disc brake?

Postby Duck! » Mon Jun 19, 2017 6:46 pm

The M615 brakes, along with the rest of the M610 series Deore, will soon be getting phased out and replaced by the new, very much evolutionary M6000 series. Which means remaining stock of the 615s may get a little cheaper until they run out.

They are an excellent brake, sharing much of the architecture with the higher-spec M785 XT and M675 SLX. M6000 will be similarly derivative from M8000 XT & M7000 SLX, differing in only small details.

One fairly common criticism of that generation of brakes is that they can be a bit grabby due to the action of the stroke ratio-altering "ServoWave" cam, especially when resin pads are used. The new generation have a revised cam profile which gives a more progressive feel. Switching to metal rather than resin pads will also improve the modulation and take the grabbiness out.
I had a thought, but it got run over as it crossed my mind.

nandystam
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Re: Deore M615 still a recommended disc brake?

Postby nandystam » Tue Jun 20, 2017 9:39 pm

I'm having trouble sourcing the M615s at a decent price from a reliable shop. How much of a downgrade would the M396's be?

I'm assuming the M396 is Shimano's entry level disc brake, but I'm not sure how that would compare to the Tektro's. I know the HDC-300s that I have aren't great by any stretch, but would the M396 be a significant upgrade?

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Re: Deore M615 still a recommended disc brake?

Postby Duck! » Tue Jun 20, 2017 10:13 pm

Depends what you want to do with them. The M396s are quite dependable and plenty adequate for general use, but lack the serious grunt for heavy off-road use, not helped by not having the option to use metal pads.
I had a thought, but it got run over as it crossed my mind.

nandystam
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Re: Deore M615 still a recommended disc brake?

Postby nandystam » Tue Jun 20, 2017 10:15 pm

It's for a flat bar roadie, so no off-road use. Perhaps I can balance out the M396s with better rotors? I read one review that suggested using SLX rotors and some better pads with these calipers?

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Re: Deore M615 still a recommended disc brake?

Postby Duck! » Tue Jun 20, 2017 10:33 pm

You're pretty limited with pad options; different "families" of Shimano brakes use different pad shapes, and the ones that offer metal compound options simply don't fit those calipers. Different rotors - which will be compatible with metal pads that you can't fit :mrgreen: - will give a little boost in performance but not massive. The big limitation with the basic brakes is the master (brake lever) cylinder : slave (caliper) cylinder ratio and how x much fluid volume diplacement results in y much piston/pad advancement & clamping force on the rotor, and there's nothing you can do to change that. Plus, remember you're on relatively narrow tyres, so the ultimate limit is how much grip they have on the ground. Yes the M396s have shortcomings, but you're highly unlikely to find them on the road.
I had a thought, but it got run over as it crossed my mind.

nandystam
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Re: Deore M615 still a recommended disc brake?

Postby nandystam » Tue Jun 20, 2017 10:49 pm

Thanks for the detailed response. So based on your last sentence, you wouldn't recommend the M396s?

Is there something more suitable I should look at as an alternative?

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Re: Deore M615 still a recommended disc brake?

Postby Duck! » Tue Jun 20, 2017 10:58 pm

I wouldn't if you were seriously mountain biking, but you're not, so they're fine. :-) I'll add a bit of emphasis to the last bit of my previous post.... "Yes the M396s have shortcomings, but you're highly UNlikely to find them on the road." :wink:
I had a thought, but it got run over as it crossed my mind.

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Re: Deore M615 still a recommended disc brake?

Postby nickdos » Wed Jun 21, 2017 3:48 pm

Just saw these on CRC http://www.chainreactioncycles.com/au/e ... prod159585 (Deore model that preceded the M615) - $32 each side but you'll have to swap the lines over left-right, which is easy to do, just pickup a Shimano funnel bleeding tool and some mineral oil on the order.

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Re: Deore M615 still a recommended disc brake?

Postby Duck! » Wed Jun 21, 2017 6:51 pm

Contrary to the listing heading, they're not Deore, they're a "non-series" model.
I had a thought, but it got run over as it crossed my mind.

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