Author Topic: New Mk3 Mercury  (Read 428 times)

Rockymountain

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Re: New Mk3 Mercury
« Reply #15 on: September 14, 2020, 07:30:19 PM »
I'd be interested in theories or facts on the mismatch issue.
The arguments for disc brakes are well rehearsed, whether you agree with them or not - No rim wear, consistent all weather braking, improved modulation (Subjective) lighter force required (maybe seen as some as a disadvantage)
The Mercury can be set up with a choice forks, so can be made suitable for either front brake.  So maybe the question ought to be turned on it's head and rather than ask why a disc at the back, ask why not a disc on the front?  Thorns answer to that is in the brochure, basically a disc requires a stiffer fork and a stiffer fork is a bit heavier and more importantly obviously less compliant. 
How much does that matter?  Well IMO it depends on the bike, it's use and the tyres.  On my non Thorn do it all 29er tourer with 50mm tyres, I have discs on both wheels.  On my sports tourer Mercury with 32mm tyres, I've chosen the most comfortable fork, which means it can't have disc brakes. 
As usual, a certain poster is happy to call the ideas of others daft without any attempt to further the conversation.

That's a good summary of the issues and makes perfect sense - it's all about the forks and the ride comfort.....and as you say, to be fair to Thorn, they do offer the choice of brakes both front and rear.

martinf

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Re: New Mk3 Mercury
« Reply #16 on: September 15, 2020, 12:11:23 AM »
"My Raven Tour predates this idea, and has CSS front and rear. I have not yet had any problems braking in the wet."
Snap. Almost.
My Raven Tour also had CSS front n rear.
But I hate them. If I had the dosh I'd change 'em.
I've gone through all types of pads, normal, pink salmon etc.
Always getting squealing after a while. And don't get me started on wet weather non- breaking. Suicidal springs to mind.
I don't doubt your own happiness with them but for me - a no.no.

I wouldn't say happiness, just not a problem at the moment, so if it ain't broke (yet) why fix it.

Maybe it is a function of wear. My CSS rims haven't done all that much distance yet. I am still on the original blue brake pads supplied with the bike. But I bought a small stock of replacement CSS brake pads for when the originals wear out, as these special pads will probably not be available in the future.

If wet weather braking does start to be a problem I won't hesitate to change at least one rim, maybe both. Not worth the risk of not being able to stop. I would probably use something a little wider (Andra 40 ?) if this is possible.

Doing a swap for Andra 30 non-CSS rims should be fairly cheap if you use the same spokes - these rims are currently about 30 each from SJS in the UK. For me in France it would make more sense to get them from a German website where they are much cheaper, about 20 (23 for Andra 40), shipping is currently much cheaper inside mainland Europe than from the UK.

Squealing doesn't really bother me, but it annoys my wife a lot if it happens when I am riding with her, so I generally try and fix it. So far I have managed to solve squealing by one or a combination of:
- cleaning the rims with solvent
- lightly sanding the brake pads
- toeing-in the brake pads

My CSS rims squealed at first and then stopped after a few rides, so I haven't yet had to do anything about it on my Raven Tour tourer. Perhaps this is also something that increases with wear (of rim or brake or brake pad?).


Matt2matt2002

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Re: New Mk3 Mercury
« Reply #17 on: September 15, 2020, 08:27:13 AM »
"My Raven Tour predates this idea, and has CSS front and rear. I have not yet had any problems braking in the wet."
Snap. Almost.
My Raven Tour also had CSS front n rear.
But I hate them. If I had the dosh I'd change 'em.
I've gone through all types of pads, normal, pink salmon etc.
Always getting squealing after a while. And don't get me started on wet weather non- breaking. Suicidal springs to mind.
I don't doubt your own happiness with them but for me - a no.no.

I wouldn't say happiness, just not a problem at the moment, so if it ain't broke (yet) why fix it.

Maybe it is a function of wear. My CSS rims haven't done all that much distance yet. I am still on the original blue brake pads supplied with the bike. But I bought a small stock of replacement CSS brake pads for when the originals wear out, as these special pads will probably not be available in the future.

If wet weather braking does start to be a problem I won't hesitate to change at least one rim, maybe both. Not worth the risk of not being able to stop. I would probably use something a little wider (Andra 40 ?) if this is possible.

Doing a swap for Andra 30 non-CSS rims should be fairly cheap if you use the same spokes - these rims are currently about 30 each from SJS in the UK. For me in France it would make more sense to get them from a German website where they are much cheaper, about 20 (23 for Andra 40), shipping is currently much cheaper inside mainland Europe than from the UK.

Squealing doesn't really bother me, but it annoys my wife a lot if it happens when I am riding with her, so I generally try and fix it. So far I have managed to solve squealing by one or a combination of:
- cleaning the rims with solvent
- lightly sanding the brake pads
- toeing-in the brake pads

My CSS rims squealed at first and then stopped after a few rides, so I haven't yet had to do anything about it on my Raven Tour tourer. Perhaps this is also something that increases with wear (of rim or brake or brake pad?).

Good thoughts. Thank you.
I believe my problem could be down to wear.
But watch out for the wet weather issue.

Never drink and drive. You may hit a bump  and spill your drink

PH

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Re: New Mk3 Mercury
« Reply #18 on: September 15, 2020, 10:11:04 AM »
The front rim on my Mercury is CSS, about 11 years old and and at least 40,000 miles.  It started out with the blue pads, then once the surface had worn smooth, I moved to the Koolstop Salmon.  I have the same brakes and pads on another bike with standard aluminium rims, there's no difference in braking wet or dry.
It's odd how people have such different experiences of the same components.

This might be an unintended advantage of mixing disc and rim brakes - In the dry there's little difference between them, but when it's wet the back brake becomes the more powerful (Whatever the rim) I can think of several scenarios where that would be a good thing.

Mike Ayling

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Re: New Mk3 Mercury
« Reply #19 on: September 17, 2020, 07:56:13 AM »
I am a happy Mercury owner with a V brake on the front.

I do most of my braking on the front and only use the disc if I need to stop in a hurry.

I wonder whether there might be an issue brazing the V brake pegs onto those nice slim thin gauge seat stays?

Mike