Hi everyone. I recently purchased a Giant TCR1 with Ultegra 10 speed. It came with a 53-39 / 11-23 gearing combination, that Im not quite happy about now. From my kind of riding and some calculations that I've done, looks like my dream combo is something like a 53-42 / 13-25.
My questions:
- Does shimano make 42 chainrings for Ultegra 10 speed? (I've not seen this in their web site) - If they don't, is there any other 42 chaingring out there that can be used with 10 speed ultegra? - Any comments on the 13-25 gearing?.
Thanks every one, I really appreciatte your comments
It sounds like you're trying to cut back the high end a bit without changing the lower gears? There's no Ultegra 42 inner chainring, but FSA makes one.
It sounds like you're trying to cut back the high end a bit without changing the lower gears? There's no Ultegra 42 inner chainring, but FSA makes one.
All it takes is a generic 130BCD 42 for the inner ring.
Hi everyone. I recently purchased a Giant TCR1 with Ultegra 10 speed. It came with a 53-39 / 11-23 gearing combination, that Im not quite happy about now. From my kind of riding and some calculations that I've done, looks like my dream combo is something like a 53-42 / 13-25.
So, you want to decrease your "top" gear, keep your lowest/climbing gear essentially the same, and just have smaller increments between them?
I am also in Perth and have reached a similar conclusion to that of Ronanmk, however this may be for different reasons.
I curently have a triple 52/42/32, and 12-25 (9) cassette (105) and find myself constantly looking for the "missing" 16 and 18 tooth rear sprockets.
My conclusion was to go for Ultegra10 with 13-25 or even 13-27 with a triple on the front. These can be purchased locally through any good Giant/Shimano dealer. Try Runners World in West Perth if your LBS can't help.
So, you want to decrease your "top" gear, keep your lowest/climbing gear essentially the same, and just have smaller increments between them?
Exactly. I never drop to the 11th cog, and very hardly ever to the 12th. For my kind of riding, 53-42 / 13-25 would give me:
- Good top speed for my fitness level (~48kmph @90 rpm) - A nice range of 1 step increments (13-19) - Better speed at medium range with the 42 chainwheel (the 39 would give me ~29 max speed at the 16th cog @ 90 rpm - too low) - A good lower range in case I need it (Perth is not THAT hilly)
Exactly. I never drop to the 11th cog, and very hardly ever to the 12th. For my kind of riding, 53-42 / 13-25 would give me:
- Good top speed for my fitness level (~48kmph @90 rpm) - A nice range of 1 step increments (13-19) - Better speed at medium range with the 42 chainwheel (the 39 would give me ~29 max speed at the 16th cog @ 90 rpm - too low) - A good lower range in case I need it (Perth is not THAT hilly)
I'll try runner's world. Thanks!
But by increasing the chainring size to 42 and changing the sprocket from starting at 11 to 13, the difference is not that much and the higher sprocket actually workls out to be slightly bigger. It seems to me that you would be spending money for very little difference. I had a 53/42 before and know what it is like. I think you would be wasting your money for something so slight.
But by increasing the chainring size to 42 and changing the sprocket from starting at 11 to 13, the difference is not that much and the higher sprocket actually workls out to be slightly bigger. It seems to me that you would be spending money for very little difference. I had a 53/42 before and know what it is like. I think you would be wasting your money for something so slight.
Mmmm...I dont quite follow. I'm not going to use the 42 chainring with the lower (13-15) gears. This is what the gearing looks like: 53/42/13-25 '@90 RPM 53.0 Kmph 42.0 Kmph 13 4.1 48.4 14 3.8 45.0 15 3.5 42.0 16 3.3 39.4 2.6 31.2 17 3.1 37.0 2.5 29.4 18 2.9 35.0 2.3 27.7 19 2.8 33.1 2.2 26.3 21 2.0 23.8 23 1.8 21.7 25 1.7 20.0
But, since I'm in a 53-39 / 11-23 combo now, its a two step process...first change the cassette, later on change the small ring.
I agree with changing the cassette first. Your lowest gear with 39/23=1.69, with 42/25=1.68. Try the 39/25=1.56 first, it may make your favourite hill just that bit easier. You are not loosing any top speed by leaving the small ring small, I see only advantages in having the one lower gear, Spring St for example.
