Chainset compatibality

[ron2old]

Does anyone know whether a Shimano SLX M675 2013 10spd Hollowtech II Chainset 40/28T would fit my Pinnacle Arkose 3 and whether it would function with my 105 10spd changers and rear derailluer.

[LWaB]

The rear mech doesn't care what chainset you use, provided it can cope with the total range.

The chainrings and crankarms will probably clear the chainstays but I don't know for sure.

Whether your levers are compatible depends on your front mech but few road-compatible front mechs work well with a 40t big ring. You may need to use a triple front mech mounted very high (effectively middle and small ring, rather than big and middle).

[ron2old]

Thanks for that LWaB. It doesn't matter that the chain set/crankset is a mountain bike one then. They don't seem to do a 40/28 for road use for some reason.

[honesty]

It does as far as i understand. 10 speed road shifters are not compatible with 10 speed mountain front derailleurs. The pull is different. You can use 10 speed rear derailleurs but only on 9 speed systems i think.

[CREPELLO]

As was said, there's no concern about rear mech compatibility. The question is whether you can use your existing front mech. Moving between two chainrings is a lot easier than moving between three. So there may be a chance that your front mech will cope with the MTB chainset.

Await confirmation from others on this.

[cycleruk]

The main query is will your existing front derailleur cope with the reduction in diameter of the new chainrings?
You will have to lower the derailleur to match the 40/28 without it catching on the chainstay?
As well, the M675 is 5mm further out than the current chainset. (chainline goes further out by 5mm) This means the derailleur has to be capable of reaching out further, at full movement, to shift the chain onto the big ring?
If not then you just can't swap to a mountain bike version (which would seem the obvious answer) as the "cable pull" doesn't match your STI shifters.
There should be no problem with the chainset itself but you might have to shorten the chain slightly for best results.
It all boils down to the whether the front derailleur will cope or not?

[531colin]

http://forum.ctc.org.uk/viewtopic.php?f=1&t=72923&start=60

[RickH]

You can use 10 speed rear derailleurs but only on 9 speed systems i think.

It is the other way round - you can use a 9 speed MTB derailleur with a 10 speed road system. 10 speed MTB doesn't work with 10 speed road (& probably not with 9 speed road either).

Up to 10 speed Shimano road/ 9 speed MTB there the same amount of cable pull produced the same amount of sideways movement in the derailleur cage. That was changed with 10 speed MTB. (Other makes are different again, hence the periodic "Shimergo" discussions.)

Rick.

[Wesh-Laurence]

Hi Ron,

I assume you're still trying to lower the gearing on your Pinnacle Arkrose.

Here's the Shimano Compatibility Chart:-

http://www.shimano.com/publish/content/ ... le.html/01)%20Drivetrain%20Compatability%20Chart.pdf

As I told you in your original posting you'll have to replace nearly all of your drivetrain to get significantly lower gearing.

[CREPELLO]

Here's a link to a picture of a similar set up that you're looking for by Ayesha...
viewtopic.php?f=5&t=59435&p=502472&hilit=+alpine+double#p502472
I note that Ayesha uses a road triple mech and you have a road double. I would try your existing mech first. But it's clear that you don't necessarily have to do things by the book, given a little research...such as coming to this forum

[CREPELLO]

I'd also add that touring bikes are regularly fitted with MTB chainsets and bottom brackets, albeit with the larger 48/36/26 ratios, in conjunction with road STI's and front mech's. They shouldn't go together but they do and even the big bike producers are doing it, not just old codgers on a cycling forum.

[ron2old]

Hi Wesh-Laurence, yes your correct I,m still struggling with my first purchase of the Arkose 3. How nice that you remember! You may also remember that I said I would stick with it and give it a good go first. Well I have for 3 months and 1100 miles now. I keep trying to convince myself I,m happy but deep down I know I,m not. Yes I can manage to get up the hills now but not in the way I want. I want to be able to ride the hills the way I do the flat - nice and steady and looking around at the view and enjoying the climb not an all out heart thumping effort where the only enjoyment is in reaching the top. I want to savour the climb and enjoy the view and then seek out further climbs for more enjoyment - not try and prove something to myself or anyone else by doing it 2 seconds faster than last time. The 40/28 chainset looked like it could bring about the change I wanted. But at £140 not even counting labour costs to have it fitted? To go ahead on a it might work might not basis is daunting to say the least. It seems the real answer is to buy the right bike in the first place, but how do you know the right bike until you've ridden it a few hundred miles? My wife does'nt understand me! No really it's true this time. On new years day I spent £1,000 on a bike joined the CTC and set a new year resolution to ride my new bike and get fit. Now I'm telling my wife the bike's not for me but cycling is and I just need a new bike. She does'nt understand to her a bike is a bike and £1,000 is a lot of money. I,ve got the set up right with this bike thanks to the help of 531 Colin and others on this sight. It's just the kind of riding I want to do requires lower gearing and there does'nt seem a way to adapt this bike for that. Do I risk buying the 40/28 chainset and hope it works or do I risk a divorce and buy a new bike? Why are there no definate answers about these things. I'm obviously not the first to tread this path!

[531colin]

Ron....
read Bruceys post in your previous gearing thread here...http://forum.ctc.org.uk/viewtopic.php?f=1&t=72923&start=60

edit...may be more choice of rings for these...http://www.spacycles.co.uk/products.php?plid=m2b0s109p2003

edit/edit...this guy worked it out in the end, I think....http://forum.ctc.org.uk/viewtopic.php?f=5&t=71220....there may be more!!

[SimonCT]

If its any help, I use similar gearing set ups with older 7 speed transmissions. Typically 13-28 or 14-32 cassette with stronglight double 40/28 or 42/30. Mechs are short arm 105/DX rear, campag athena racing double front. It works perfectly for me.

Those small double chainsets give a good range of touring ratios. The old inexpensive Stronglight 86mm BCD design was perfect and its a shame they're no longer made. £140 is a lot for a chainset! Hopefully now they're becoming fashionable again we'll get some lower priced ones.

[cycleruk]

Perhaps ron2old you could P.M. this chap and see what his set up is.:-
viewtopic.php?f=32&t=74103

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