Spa Cycles Super Compact Chainset

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burroc
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Spa Cycles Super Compact Chainset

Postby burroc » 19 Feb 2017, 7:29pm

I am thinking of lowering my gearing by fitting a TD-2 Super Compact Chainset from Spa Cycles to my Genesis Equilibrium road/touring bike. Although I already have a mountain bike cassette on the rear (11-34) I still find with the 34 small front chainring the gears don't quite go low enough for me. I never use the larger chainwheel at all - I am very much a "high cadence, low speed" cyslist.

I am tempted to try a 28/36 front chainset. I appreciate that the Spa Super Compact really is a triple with the larger chainwheel replaced by a blank, but there does not seem to be any real alternative. However I don't want to end up with a cheap Heath Robinson arrangement that does not shift smoothly. Has anyone else tried the Super Compact and (not being the most expert of bike mechanics) am I missing the obvious that would mean the 28/36 just would not be suitable? I appreciate I will have to fit a square tapered bottom bracket.

Many thanks.

fastpedaller
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Re: Spa Cycles Super Compact Chainset

Postby fastpedaller » 19 Feb 2017, 8:01pm

Wouldn't a triple do the job better and also give closer gears?

Valbrona
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Re: Spa Cycles Super Compact Chainset

Postby Valbrona » 19 Feb 2017, 8:31pm

How is your front derailleur fixed to the frame? Clamp or bracket? Because it needs to be lowered ...
I should coco.

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531colin
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Re: Spa Cycles Super Compact Chainset

Postby 531colin » 19 Feb 2017, 9:32pm

Image

Thats the prototype "lash-up" chainset with home-made filler pieces to blank off the big ring position. I rode that chainset, and also a 24/40T chainset both with 105 11 speed. (on spa Elan prototypes)
I couldn't make them shift badly, and I tried (as you would with prototypes)
All the chainsets have 16T difference between the 2 rings, because thats what current Shimano F. mechs are designed for. It does mean a big jump when you make the shift, and this is awkward if you are riding in a tight-formation group that wants to press on all the time....its OK if you are on your own, or in a relaxed group.
The F. mech will need to drop down a fair way.

Bonefishblues
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Location: Near Bicester Oxon

Re: Spa Cycles Super Compact Chainset

Postby Bonefishblues » 19 Feb 2017, 9:39pm

Is something I've been musing on myself for an n-1 bike

cf the Shropshire special on this page for an application:

http://www.beaumontbicycle.com/

jamesofyorkshire
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Re: Spa Cycles Super Compact Chainset

Postby jamesofyorkshire » 20 Feb 2017, 5:56am

I also want lower geared chain rings to drop the overall gearing. I already have a 36 on the back but would prefer a closer ratio cassette on the back. 34/50 seems overgeared for a lot of steady peddlers. How often does anyone use their highest 3 gears??? Probably less than once a month for me....when I might get lucky and have a tailwind on a slope.

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mellon farmer
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Location: Tavistock, Devon

Re: Spa Cycles Super Compact Chainset

Postby mellon farmer » 20 Feb 2017, 4:33pm

On a similar note, I used the 2 inside rings on a road triple with a chain guard in the outer position 42/30 was absolutely fine. Now riding a compact with 44/34 to 32 cassette, also using an ultegra ss rear mech with no problems!

blackbike
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Re: Spa Cycles Super Compact Chainset

Postby blackbike » 21 Feb 2017, 1:08pm

Have you considered a 42/32/22 MTB triple?

They give very low gearing with a reasonable top gear for most people.

Cheaper Shimano ones like Alivio and Acera are of quite good quality, as is the one Decathlon sells.

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cycleruk
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Location: Lancashire

Re: Spa Cycles Super Compact Chainset

Postby cycleruk » 21 Feb 2017, 2:54pm

Problem with a triple is I'm guessing the OP has a double changer.
You'll never know if you don't try it.

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bigjim
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Re: Spa Cycles Super Compact Chainset

Postby bigjim » 21 Feb 2017, 3:23pm

blackbike wrote:Have you considered a 42/32/22 MTB triple?

They give very low gearing with a reasonable top gear for most people.

Cheaper Shimano ones like Alivio and Acera are of quite good quality, as is the one Decathlon sells.


How would STIs and front mech cope with MTB chainset?

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cycleruk
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Re: Spa Cycles Super Compact Chainset

Postby cycleruk » 21 Feb 2017, 4:05pm

bigjim wrote:
blackbike wrote:Have you considered a 42/32/22 MTB triple?
They give very low gearing with a reasonable top gear for most people.
Cheaper Shimano ones like Alivio and Acera are of quite good quality, as is the one Decathlon sells.


How would STIs and front mech cope with MTB chainset?

Not easily
Chainline is different and a road front mech' will have problem of shifting chain onto big ring.
Something I'm looking at as I have that very problem. The mech' sometimes won't shift the chain to the big ring.
I'm considering buying a Mech' with on oversize clamp and then offsetting it outwards.
Another option is to use a braze-on front mech and fit a modified band-on adapter to move the mech' outwards.
You'll never know if you don't try it.

burroc
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Joined: 11 Aug 2009, 9:32pm

Re: Spa Cycles Super Compact Chainset

Postby burroc » 21 Feb 2017, 5:08pm

Thanks very much for the various responses. As one person has correctly summised, I have a double front changer so am looking to stick with a compact chainset rather than moving to a triple.