105 Compact or Double?

What bike and bike bits should you buy?
JoeAllez11
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Joined: Wed Sep 19, 2012 18:32 pm

105 Compact or Double?

Postby JoeAllez11 » Sat Nov 03, 2012 21:49 pm

I live in an area with all the normal hills, not very mountainous. I am upgrading from my Sora to Compact :)

Also, do I need a new front mech?

lc1981
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Re: 105 Compact or Double?

Postby lc1981 » Sat Nov 03, 2012 22:27 pm

Impossible to say without knowing how strong a rider you are.

JoeAllez11
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Joined: Wed Sep 19, 2012 18:32 pm

Re: 105 Compact or Double?

Postby JoeAllez11 » Sat Nov 03, 2012 22:29 pm

Oh okay, fair enough but do I need a new rear mech. Im guessing a compact is easier?

lc1981
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Re: 105 Compact or Double?

Postby lc1981 » Sat Nov 03, 2012 23:06 pm

A compact will give you lower gearing, so it'll be a bit easier on the hills, at the expense of top-end speed (perhaps, if you tend to use the top gear at present).

jibberjim
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Re: 105 Compact or Double?

Postby jibberjim » Sun Nov 04, 2012 07:12 am

Everyone should buy a compact, unless they know they need a double. Changing a compact gearing to a double gearing will cost <30quid, changing a double to a compact will cost a new chainset.
Jibbering Sports Stuff: http://jibbering.com/sports/

BuckMulligan
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Re: 105 Compact or Double?

Postby BuckMulligan » Sun Nov 04, 2012 09:00 am

You don't need new mechs unless you're coming from a triple chainset. If that's the case you'll want a double specific front mech and a short cage rear mech, although you could run the old ones if necessary, they just won't give as nice shifting.

JoeAllez11
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Joined: Wed Sep 19, 2012 18:32 pm

Re: 105 Compact or Double?

Postby JoeAllez11 » Sun Nov 04, 2012 09:24 am

Okay thanks very much :) Is there a huge difference between the compact or double? I am nearly always in the large chainring on the front.

jibberjim
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Re: 105 Compact or Double?

Postby jibberjim » Sun Nov 04, 2012 09:28 am

JoeAllez11 wrote:I am nearly always in the large chainring on the front.


Everyone in the UK is - but when you need to go up steep hills, you won't be. And even though you're in the big ring at the front, you're not also in the 11.
Jibbering Sports Stuff: http://jibbering.com/sports/

JoeAllez11
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Joined: Wed Sep 19, 2012 18:32 pm

Re: 105 Compact or Double?

Postby JoeAllez11 » Sun Nov 04, 2012 09:33 am

Okay fair enough.

Herb71
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Re: 105 Compact or Double?

Postby Herb71 » Sun Nov 04, 2012 09:40 am

I have just changed to a compact. I have always had my road bike on 53/39 at the front and 11/23 on the rear and that's always been fine for the mild undulations around my locale. I never used the highest gearing much, so after finding out what real hills are during a recent Pennines sportive, I have changed to 50/34 front and 13/26 rear in preparation for next year.

I am quicker up the mild hills round here as I can spin a bit more and I can climb everything seated now, unless I really want to attack a given hill. I still have a high enough gear for most stuff, although I can spin out on the steeper descents. I run out of revs at about 38 mph and am coasting from there on.

I would say a compact is a useful change for all but the strongest riders for regular road riding / training. I wish I had changed years ago. No change to either mech was required.
Last edited by Herb71 on Sun Nov 04, 2012 13:24 pm, edited 1 time in total.

JoeAllez11
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Joined: Wed Sep 19, 2012 18:32 pm

Re: 105 Compact or Double?

Postby JoeAllez11 » Sun Nov 04, 2012 10:19 am

Thanks for that :) I have an 11/25 on the back so I think a compact on the front is a good idea :) There's only been a couple of descents when ive got over 40 anyway

centimani
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Re: 105 Compact or Double?

Postby centimani » Sun Nov 04, 2012 10:37 am

jibberjim wrote:Everyone should buy a compact, unless they know they need a double. Changing a compact gearing to a double gearing will cost <30quid, changing a double to a compact will cost a new chainset.


Best advice....
Yes you lose a bit on the top end (running a 50 instead of a 53), but you gain so so much versatility on the small chainrings by spending circa £15 on a 36, 38, 39 or 40, the options are easy and cheap. Top that with the fact you can switch small chainrings in 15 minutes, so if you want a day 'in the mountains' you can swap easily.
Chainlength isnt really an issue, whenever i buy a compact 50/34, i immediately change the 34 for a 40...no change in anything else required.

JoeAllez11
Posts: 26
Joined: Wed Sep 19, 2012 18:32 pm

Re: 105 Compact or Double?

Postby JoeAllez11 » Sun Nov 04, 2012 11:32 am

Thanks very much. I think im going to get the Shimano 105 Compact Crankset and am considering new brakes and a new front mech.


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