Gearing Questions
- rdp_au
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Re: Gearing Questions
Postby rdp_au » Mon Jul 22, 2013 10:49 am
And, to the comment about the old ‘corncob’ clusters and need to double shift. Well, it was a fact of life when you’ve only got 5 or 6 ratios to choose from, you had to use them all. On modern 9 and 10 speed systems, double shifting is avoided by simply not using many of the possible combinations.
- andione1983
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Re: Gearing Questions
Postby andione1983 » Mon Jul 22, 2013 11:05 am
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- Xplora
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Re: Gearing Questions
Postby Xplora » Mon Jul 22, 2013 12:30 pm
eon reckons 12-27 is the one for him, but he's also running a 39 granny gear... and a VERY strong rider.
Check out http://www.gear-calculator.com/#" onclick="window.open(this.href);return false; for the best comparison tool I have found. It really comes down to you, andy. Me? I want to keep my place in the paceline, which is just as hard for me as charging up mountains. We're ultimately talking about one or two gears... do you want your climbing gears to be close, or as low as possible? do you want your flat gears (15-19) to be plentiful, or are you more worried about getting up the hills? Do you really need to waste your time with an 11 cog? I set a KOM yesterday coming down the mountains because I had my 11. But I wouldn't use that gear more than once a fortnight if I'm lucky LOL
What gears are you sitting in most of the time for climbing, pacelines and sprinting? That pretty much answers your original question. If I wasn't going on any climbs, 12-23 is the best for me. If I was, 11-28 helps me capitalise on my strengths.
- rdp_au
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Re: Gearing Questions
Postby rdp_au » Mon Jul 22, 2013 12:35 pm
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- hannos
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Re: Gearing Questions
Postby hannos » Mon Jul 22, 2013 1:54 pm
I can spin up any hills using these combo's.
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Re: Gearing Questions
Postby as7431 » Mon Jul 22, 2013 2:36 pm
Thanks
Tim
- queequeg
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Re: Gearing Questions
Postby queequeg » Mon Jul 22, 2013 3:02 pm
Just pointing out that Sydney extended beyond the confines of the CBD.Philipthelam wrote:Fair enough, but why does it matter?
I know someone that lives in dural, it takes quite a while (a long time!) to get there and I would say is very different to my idea of what living in "sydney" is. You have to turn on high beam on the roads there and the houses are massive, he lives in a three storey house. He has a swimming pool and a tennis court in his back yard, the land is probably several acres/hectares... I don't know. Compared to others, his house/land is not that big. Hence the reason for my uninformed opinions.
I live in Dural. I commute every day to Nth Sydney on a bicycle. Everyone thinks it is in the country, but It takes just under an hour. It takes 90 minutes on a bus! As the crow flies it is less than 20km to the CBD. I don't live in a massive house on acres of land.
I do have the convenience of being a short ride to Galston where I can access pretty much all the Northern Sydney rides, but I am not averse to riding to the other side of the city either. I have done Dural to Kurnell & back more than a few times. Sure, a new cyclist is not going to be riding 150km+ in a day, but when Centennial Park loops become boring, there is a whole expansive city to explore.
- Derny Driver
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Re: Gearing Questions
Postby Derny Driver » Mon Jul 22, 2013 8:11 pm
YES you can buy a single 18 tooth Ultegra Shimano cog. And yes, if you remove the end 11 cog, you need to replace the 12 with an end 12. They are different.as7431 wrote:Can you buy single 18t gears that are compatible with an Ultegra 10 speed cassette? I have a 12-25, which I use all the time, and a spare 11-28, which I was thinking of turning into a 12-28 for the hills, by removing the 11 and adding an 18 (which I is the gear I miss in my 12-25 too). Is this possible? Do I need to change the 12 to one made for the end of a cluster? I can not remember if the last one is different to the others?
Thanks
Tim
- Duck!
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Re: Gearing Questions
Postby Duck! » Mon Jul 22, 2013 8:38 pm
You can in theory buy a single 18T sprocket for Ultegra cassettes, but it's out of stock with Shimano Aus. Remember you'll also need an additional sprocket spacer to go with it as the 11 you'll remove has its spacer integrated. The 12T sprocket is the same whether it's the 9th or 10th gear, so you won't need to change that.as7431 wrote:Can you buy single 18t gears that are compatible with an Ultegra 10 speed cassette? I have a 12-25, which I use all the time, and a spare 11-28, which I was thinking of turning into a 12-28 for the hills, by removing the 11 and adding an 18 (which I is the gear I miss in my 12-25 too). Is this possible? Do I need to change the 12 to one made for the end of a cluster? I can not remember if the last one is different to the others?
Thanks
Tim
It may be easier (but more expensive) to buy a 12-23 cassette & rifle the 18T out of it, 'cos that's the only range in the Ultegra series that features the 18.
- kb
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Re: Gearing Questions
Postby kb » Tue Jul 23, 2013 7:00 am
I'm still grinding up some hills with on 34/28. Admittedly, I did go out of my way to find themhannos wrote:For me, I prefer a compact and a 12-25. 12-28 when doing hills.
I can spin up any hills using these combo's.
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Re: Gearing Questions
Postby antipodean » Tue Jul 23, 2013 9:31 am
The clear answer is actually a question, why do you want to upgrade your gearing when the combo you have is perfectly adequate.andione1983 wrote:Certainly don't think I have a clear answer from this thread, so many options and opinions... But been a good read with the theory behind it
- andione1983
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Re: Gearing Questions
Postby andione1983 » Tue Jul 23, 2013 10:04 am
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- barefoot
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Re: Gearing Questions
Postby barefoot » Tue Jul 23, 2013 10:13 am
Having gone with the 39 ring, I also added a additional climbing gear - a 30. Not at the back though
Yep, I got a triple crankset
I haven't used my 30 ring at all yet... but it's there for when I need it. And I intend to use it, even if I have to go out of my way to find suitable hills (which may or may not be sealed - this is a go-anywhere road bike).
I've never understood why people are so eager to add an extra sprocket at the back as soon as the next generation of cassette and shifter is released, but nobody ever wants to add an extra ring.
As I see it, I have the best of all worlds. If I run a 25t cassette, my 30t ring gives almost exactly the same bottom gear as a 34t compact with a 28t cassette. But I get the nicer spread of ratios in a tighter cassette - and a more useful 39t ring to spin them with.
On my old Long Haul Trucker (which I eventually sold because I wasn't using it for "trucking" duties), I had a 52-42-30 triple and a 13-26 cassette (8-speed). I sometimes, but rarely, ran out of gears at the bottom end. I'm not sure yet whether I prefer the 39 or 42 middle ring. But the 30 is a handy friend to have in times of need
tim
- barefoot
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Re: Gearing Questions
Postby barefoot » Tue Jul 23, 2013 10:19 am
I installed a 11-32 MTB cassette on my road bike for a ride a few weeks back, and grinded up a lot of hills in 34:32. Then it got properly steep, and I had to walk. Strava records some of the bits I walked as sustained >40% gradient, peaking at 54%kb wrote:I'm still grinding up some hills with on 34/28. Admittedly, I did go out of my way to find themhannos wrote:For me, I prefer a compact and a 12-25. 12-28 when doing hills.
I can spin up any hills using these combo's.
That ride was part of the inspiration for me to switch my compact for a triple.
However low your gearing, there will always be hills to use them all.
tim
- jonbays
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Re: Gearing Questions
Postby jonbays » Tue Jul 23, 2013 10:31 am
And that will change as your fitness changes with time and your typical ride changes with time.
Call me a retro fool if you like but I am still very comfortable riding my old friction shift 12 speed with 52-42 chaining and 14-16-18-21-24-28 rear cluster. Even now at 50+ the 28 is only for when I have really bonked or for riding slowly up steep ramps. Mostly I will ride the 52-18 on the flat comfortable for 36-42kmh depending on the wind and when tiring or on small hills I drop back down to the 52-21 then 42-18 and 42-21 for longer steeper climbs. Mostly I am riding in only 5 of the 12 gears available and in gear inches that's 53-61-65-69-76 inches and those gaps are rarely a problem. When I was younger though I rode 10 speeds with 52-42 chaining and 13-15-17-19-21 rear cluster. They were like a breeze after coming of my fixed with 42-16 and even now 30 years older and 10kg heavier I still don't go past the 42-21 until I am really stuffed.
- kb
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Re: Gearing Questions
Postby kb » Tue Jul 23, 2013 1:21 pm
!?!barefoot wrote: I installed a 11-32 MTB cassette on my road bike for a ride a few weeks back, and grinded up a lot of hills in 34:32. Then it got properly steep, and I had to walk. Strava records some of the bits I walked as sustained >40% gradient, peaking at 54%
That ride was part of the inspiration for me to switch my compact for a triple.
I think I'd go a winch...
- barefoot
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Re: Gearing Questions
Postby barefoot » Tue Jul 23, 2013 2:10 pm
Oh, did I mention it was on dirt?kb wrote:!?!barefoot wrote: I installed a 11-32 MTB cassette on my road bike for a ride a few weeks back, and grinded up a lot of hills in 34:32. Then it got properly steep, and I had to walk. Strava records some of the bits I walked as sustained >40% gradient, peaking at 54%
That ride was part of the inspiration for me to switch my compact for a triple.
I think I'd go a winch...
The 4WDs ahead of me on the summit track dislodged enough rocks that they probably would have been better off winching.
http://app.strava.com/activities/59153097" onclick="window.open(this.href);return false;
But that's getting further and further from the OPs question about gearing for a road bike. Other than to say that if you have a wide enough gear range, you can ride up steep things.
tim
- Xplora
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Re: Gearing Questions
Postby Xplora » Tue Jul 23, 2013 3:29 pm
- ldrcycles
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Re: Gearing Questions
Postby ldrcycles » Sun Jul 28, 2013 8:18 pm
- barefoot
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Re: Gearing Questions
Postby barefoot » Sun Jul 28, 2013 10:16 pm
It wasn't an easy walk upldrcycles wrote:I have a local bitumen climb that Strava claims a max of 42% for, the only time I cleared it was with a 28t triple crank and 30t MTB cassette. Even at that grade it was a very fine line between the rear wheel slipping and the front leaving the ground, 54% on dirt is something else!
And the disc brakes proved their worth coming back down
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