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Road bike vs. mtb for big road climb?

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Road bike vs. mtb for big road climb?

Old 08-06-18, 11:24 PM
  #26  
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Jobst Brandt used to do the Mt Umunhum climb with a 46/26 low gear (not a typo!) No shame in getting lower gears if you’re a regular mortal.
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Old 08-07-18, 05:02 AM
  #27  
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Originally Posted by oldnslow2 View Post
Road bike for the road.

First off you SL5 is most like 17-18lbs and a MTB would be in the mid to high 20s.

If your bike is stock I would assume it has a 50/39 compact crank and a 11-28 rear. I would change the inner chainring to a 34T and put a 11-32 on the rear. The 32 rear should fit with the stock RD.
That Domane comes stock with an 11-32 and a compact crank.
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Old 08-07-18, 06:13 AM
  #28  
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Old 08-07-18, 06:25 AM
  #29  
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"One does not climb Mt. Umunhum fueled by pasta and mineral water alone."
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Old 08-07-18, 06:27 AM
  #30  
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I have wondered the same thing, and tried to compare using my two bikes (Bianchi road, Cannondale MTB). I live in what is supposedly “mountainous” country, but it is more serious hills (rides as steep as yours but not as long, and as long as yours but not as steep). When I was 11-28, the road bike was less forgiving. When I felt off, I needed to stand, zig and zag etc. I switched to 11-32 (which costs so I wouldn’t agree you should do it just for the one ride), and it makes a lot of difference. I’d say the road bike and mtb are now comparable: mtb is easier if you can accept easy and quite slow; road is easier if you want to ride at a bit quicker pace. Since you’re bigger than me, and maybe don’t ride as much, I’d think you’d want the mtb for that ride.
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Old 08-07-18, 07:35 AM
  #31  
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The climb profile on the PJAMM site indicates the main climb is 7 miles at about 8% average ascent.

Looks like a good challenge. If you already have a compact 50-34 front and 11-32 rear and enjoy climbs you should be fine on your Domane. You will be better able to stand up and activate different muscle groups to summit.

GCN has several videos on climbing if interested?

https://pjammcycling.com/climb/446.H...munhum%20south

https://pjammcycling.com/climb/445.H...munhum%20north
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Old 08-07-18, 07:42 AM
  #32  
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Originally Posted by jaycb74 View Post
Over 3k climb in Bay Area (Mt Umunhum) , pretty steep in some sections. I have a brand new Domane SL5 disc vs. 2009 Gary Fisher Aluminum mtb. The Domane is way lighter (best guess 10-15 lbs?) and just faster but the MTB has about what I consider 3-4 granny gears on it, the Domane with compact really difficult in steep sections. So for an over 200 lb guy, which would you choose to tackle the beast? Does the weight savings and overall better bike of the Domane help me get up the mountain easier or should I take the granny gears on the older heavier bike?
i sort of have the same. Roadbike (CX bike) was shattered by a car, so I stuck road tyres in my MTB and re-joined the local ride up Sandia Crest on that. 13 miles up, almost 4,000’ of climbing. The X-cal has a triple, and I was weak after 3 weeks in a hospital bed and another 3 months non-weightbearing in the left.

I just did it in phases. I would ride to a parking lot one week, the next one the next week. I did summit on the X-Cal. But I admit I always wanted a road bike.

Unsurprisingly, when I got a used Defy 3 and summitted in that, I was a whole 2m faster than on the MTB. I had slightly less gear (I hated to use the 22 on the MTB after week 1) and never felt out of gears.

Been a month on the Defy, and last run was stopped by thunder at 10,000’ up, but times are dropping. I say the Domane. Maybe with a nice fat cassette
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Old 08-07-18, 08:39 AM
  #33  
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Years ago I read somewhere that, if you're in doubt about managing a climb, put your bike into it's lowest gear and pedal as slowly as you can manage. Slow and steady gets it done. It gives your body more time to process oxygen.

You sound like you're in doubt. Steep + long = hard. That's going to be a pretty hard hill. I'd take the bike with the lowest gears. Pedal smoothly and keep your front wheel weighted because it you pop a wheelie on that 20%, you're pretty much done. After you clean the hill with your mountain bike, if you still want to, you can try it again with your road bike. That 30/32 wouldn't be enough gear for me on that hill.
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Old 08-07-18, 08:46 AM
  #34  
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Originally Posted by jaycb74 View Post
No, I'm not going to do that to the Domane, most the climbs on do on it are moderate and I can handle steep stuff in small increments. Yes, I can lock out the suspension so that will be a big help but no on the slicks.
The smoothest tires for the MTB will be your friend. Knobby tires are going to suck energy. Also, a skinnier tire will be a bit smaller diameter, giving you a slightly lower gear.

A 15% grade isn't anything to sneeze at, so while I'm definitely a drop bar guy, I would recommend the mountain bike unless you are in good shape. (I'm assuming that your 200# comment isn't meaning that you are 200# of muscle...) Tires are cheap, just get whatever you can with a smooth-ish tread.
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Old 08-07-18, 08:53 AM
  #35  
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Originally Posted by jaycb74 View Post
Over 3k climb in Bay Area (Mt Umunhum) , pretty steep in some sections. I have a brand new Domane SL5 disc vs. 2009 Gary Fisher Aluminum mtb. The Domane is way lighter (best guess 10-15 lbs?) and just faster but the MTB has about what I consider 3-4 granny gears on it, the Domane with compact really difficult in steep sections. So for an over 200 lb guy, which would you choose to tackle the beast? Does the weight savings and overall better bike of the Domane help me get up the mountain easier or should I take the granny gears on the older heavier bike?
not mentioning your gear ratios? still as it came from the Shop?
(My Mt Tam hill climb bike.. Stinson beach start, was a 52 - 36 and 13 to 28 freewheel
on an aluminum AlAn, road bike, . in the 80's)



...
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Old 08-07-18, 08:58 AM
  #36  
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I probably saw you up there. Isn't that an awesome climb? The vistas of the ocean are stunning, plus the descent is to die for. People bring their million dollar Ferraris up there to test out on the hairpins, so you know it's gotta be a halfway decent road.
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Old 08-07-18, 09:10 AM
  #37  
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Originally Posted by Caliper View Post
The smoothest tires for the MTB will be your friend. Knobby tires are going to suck energy. Also, a skinnier tire will be a bit smaller diameter, giving you a slightly lower gear.

A 15% grade isn't anything to sneeze at, so while I'm definitely a drop bar guy, I would recommend the mountain bike unless you are in good shape. (I'm assuming that your 200# comment isn't meaning that you are 200# of muscle...) Tires are cheap, just get whatever you can with a smooth-ish tread.
I'm actually in pretty good shape, just a big guy at 6'3 and mostly muscle (those hazy IPAs have gotten me in the gut over the past year) but like most people, could lose 10 pounds to get to a more ideal weight.
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Old 08-07-18, 09:39 AM
  #38  
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Originally Posted by jaycb74 View Post
I'm close to 50 as well... seems mtb is the way to go for now, maybe get some lower gearing on the Domane in the long run, hard to do after just spending 2.5k on the bike (but worth every penny, love it, first road bike)
A cassette needs to be changed after every 3 chains (or fewer if you are like me). So next time the opportunity arises, get a SRAM 11-36T cassette and adjust the B-screw (if you have a medium cage derailleur, you should be fine). That is probably the most cost-effective means to getting lower gearing. (Shimano has 11-34T, but you might as well go for the 11-36T. Mine seems to last longer, for some reason.)

Or, better yet, buy it now, put it on, and save the current one, which you can put back on after you wear out the 11-36T, because by then the 11-32T (or whatever it is you have) will be enough, due to your improvement.

Also, if you find yourself wanting to change the crank at some point, read this thread for some options:
Anyone using a 46/30T crank on a road bike?

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Old 08-13-18, 03:05 PM
  #39  
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Originally Posted by expatbrit View Post


...and re-joined the local ride up Sandia Crest on that. 13 miles up, almost 4,000’ of climbing.
If I continue to get back in shape, I may come down from Taos sometime (realistically next year) and join the ride. I'd drive down with my trailer and camp overnight in the area.
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