Weight Weenie hill climber

Especially for light weight issues concerning cyclocross / touring bikes & parts.

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tbar23
Posts: 4
Joined: Fri Jun 12, 2015 9:21 pm

by tbar23

This isn't exactly a cyclocross / gravel / touring question, but it probably fits better in this category than in road. I've asked around in a few other places, but I like the focus on weight here, and would be interested in thoughts from y'all:

I have a road bike built with a Sram Red 22 groupset. Compact crank (50-34) double front chainring and an 11-speed cassette (11-28). PF30 bottom bracket.
I would like to convert this bike to a hill climber with as little modification (read "purchases") as possible.
Given the hill I have in mind, I'd ideally like to get well under 1:1 gearing ... something down around 0.9 would be nice (so either 24 to 26T ring with existing 28T cog or existing 34T ring with 36 to 42T cog).

Unfortunately, from a weight perspective, both the Red crankset and the XG-1190 cassette are wonderfully light pieces. So I'm having trouble coming up with any solution that doesn't add something in the 250 - 400g range.

What would you folks recommend?

Thanks!

by Weenie


UpFromOne
Posts: 701
Joined: Wed Apr 08, 2009 5:23 am
Location: Olympic Nat'l Park, WA

by UpFromOne

My climber has a single 34t chainring, and Recon alu 11-28 cassette. Downhills are mostly coasting but that's ok with me :)

You can always go down in 1x chainring size if you need lower gears, but a 110bcd crank spider might be limiting (33t min.) unless it's replacable with a mtb spider.

As for the cassette, a SRAM XG-1099 (11-36) is only 208g., and you can simply add a "Roadlink" to allow your current derailleur to get to the big cogs:

http://www.wolftoothcomponents.com/products/roadlink

tbar23
Posts: 4
Joined: Fri Jun 12, 2015 9:21 pm

by tbar23

So how does one figure out whether the 110bcd spider can be replaced with an mtb spider?
In this case, it would be for a Red 22 Exogram crankset.

UpFromOne
Posts: 701
Joined: Wed Apr 08, 2009 5:23 am
Location: Olympic Nat'l Park, WA

by UpFromOne

SRAM Red has an integrated spider, part of the crank itself.

Take a look at a SRAM S952 for an example of a carbon road crank that has a removable spider:
https://www.sram.com/sram/road/products ... 2-crankset

tbar23
Posts: 4
Joined: Fri Jun 12, 2015 9:21 pm

by tbar23

Ah, I see that now, thanks @UpFromOne.

So my options would be a new crankset and/or getting some big pie platters on the rear with a compatible RD.

Are any of the 1x or MTB cranksets drop-in replacements for a Red 22 / PF30 crankset?

alcatraz
Posts: 971
Joined: Mon Aug 29, 2016 11:19 am

by alcatraz

What about removing the smallest cog of the xg1190 freewheel and then adding a larger one at the back. Get yourself a 34 and then you're at 1.00 ratio at least, or bigger I guess but the jump would be too great from the 28.

Perhaps you can add two bigger cogs and remove your two smallest, depending on the construction of your freewheel. You might need the appropriate spacers to accomplish this, and the lock ring might need replacing, as well as adding a road link to the rear derailleur and a longer chain.

This is just an idea, I haven't thought of the details. I have seen these kinds of cog conversion kits though. For people who want to add a bigger cog or add a 16t.

/a

Edit: The "road link" that was mentioned by a previous poster enables your derailleur to use freewheels larger than it was designed for. It's just a little arm that lowers the derailleur mounting position.

reippuert
Posts: 98
Joined: Sat Apr 23, 2011 9:18 am
Location: Copenhagen, Denmark

by reippuert

tbar23 wrote:This isn't exactly a cyclocross / gravel / touring question, but it probably fits better in this category than in road. I've asked around in a few other places, but I like the focus on weight here, and would be interested in thoughts from y'all:

I have a road bike built with a Sram Red 22 groupset. Compact crank (50-34) double front chainring and an 11-speed cassette (11-28). PF30 bottom bracket.
I would like to convert this bike to a hill climber with as little modification (read "purchases") as possible.
Given the hill I have in mind, I'd ideally like to get well under 1:1 gearing ... something down around 0.9 would be nice (so either 24 to 26T ring with existing 28T cog or existing 34T ring with 36 to 42T cog).

Unfortunately, from a weight perspective, both the Red crankset and the XG-1190 cassette are wonderfully light pieces. So I'm having trouble coming up with any solution that doesn't add something in the 250 - 400g range.

What would you folks recommend?

Thanks!


An 11 speec 11-36 SRAM casette and a SRAM X0 medium deraillure should give you a decent hill climber gear with your current 34t in front and would add 200-250g

Im running 10 years old Campy chorus 10 speed shifters with a RAM XO type 2.1 rear draillure, XTR 11-36 10 speed casette, wipperman conecx 11 speed chain, Campy Chorus 2015 50/34 crank and a Campy Chorus 2015 S2 front deraillure + TRP HY/RD's.

neither should work together - but i does...

Due to the TI cogs on the 10-speed XTR casette the system weight is abouth the same as my road bike 11-29 chorus casette and an chorus deraillure. I havent regreted getting the heavier clutch type 2.x deraillure though - it nevers drops the chain ithe woods or on this summers 1800km Appenine north-south ride - often on non paved roads..
--
mvh. Morten Reippuert Knudsen @Merlin Works CR, Chorus 15, Reynolds 46/66

reippuert
Posts: 98
Joined: Sat Apr 23, 2011 9:18 am
Location: Copenhagen, Denmark

by reippuert

UpFromOne wrote:My climber has a single 34t chainring, and Recon alu 11-28 cassette. Downhills are mostly coasting but that's ok with me :)

You can always go down in 1x chainring size if you need lower gears, but a 110bcd crank spider might be limiting (33t min.) unless it's replacable with a mtb spider.

As for the cassette, a SRAM XG-1099 (11-36) is only 208g., and you can simply add a "Roadlink" to allow your current derailleur to get to the big cogs:

http://www.wolftoothcomponents.com/products/roadlink


He would have 11 speed shifters... the XG-1099 is 10 speed.
--
mvh. Morten Reippuert Knudsen @Merlin Works CR, Chorus 15, Reynolds 46/66

User avatar
F45
Posts: 871
Joined: Wed Jun 08, 2011 6:08 am

by F45

alcatraz wrote:What about removing the smallest cog of the xg1190 freewheel and then adding a larger one at the back. Get yourself a 34 and then you're at 1.00 ratio at least, or bigger I guess but the jump would be too great from the 28.


I like this idea. You would probably need to use a buddy's lathe for some spacers though.

tbar23
Posts: 4
Joined: Fri Jun 12, 2015 9:21 pm

by tbar23

Thanks all. I'm not convinced that 1:1 is low enough. That would put my average cadence around 65 rpm for 90 minutes. I'd really rather be higher than that.

@reippuert - I got similar advice from a buddy. He recommended an 11-42T 11-sp Shimano XT cassette with either Sram X7 or X9 long cage RD (10-speed). He said that is a fairly common CX setup. I think it might add more than 200g, though. It is a relatively inexpensive option, though ... so might be worth a try.

alcatraz
Posts: 971
Joined: Mon Aug 29, 2016 11:19 am

by alcatraz

36t in the back and switch your 34t chainring to a 33t (smallest available).

0.9167 ratio and the funniest looking freewheel both achieved!

You'll need a longer derailleur hanger and a longer chain.

/a

basurper
Posts: 43
Joined: Mon Jun 06, 2011 5:50 am

by basurper

You can use XTR 11sp 11-40 cassette. With a sram 10sp long cage RD.

Sent from my SM-N9208 using Tapatalk

basurper
Posts: 43
Joined: Mon Jun 06, 2011 5:50 am

by basurper

reippuert wrote:
tbar23 wrote:This isn't exactly a cyclocross / gravel / touring question, but it probably fits better in this category than in road. I've asked around in a few other places, but I like the focus on weight here, and would be interested in thoughts from y'all:

I have a road bike built with a Sram Red 22 groupset. Compact crank (50-34) double front chainring and an 11-speed cassette (11-28). PF30 bottom bracket.
I would like to convert this bike to a hill climber with as little modification (read "purchases") as possible.
Given the hill I have in mind, I'd ideally like to get well under 1:1 gearing ... something down around 0.9 would be nice (so either 24 to 26T ring with existing 28T cog or existing 34T ring with 36 to 42T cog).

Unfortunately, from a weight perspective, both the Red crankset and the XG-1190 cassette are wonderfully light pieces. So I'm having trouble coming up with any solution that doesn't add something in the 250 - 400g range.

What would you folks recommend?

Thanks!


An 11 speec 11-36 SRAM casette and a SRAM X0 medium deraillure should give you a decent hill climber gear with your current 34t in front and would add 200-250g

Im running 10 years old Campy chorus 10 speed shifters with a RAM XO type 2.1 rear draillure, XTR 11-36 10 speed casette, wipperman conecx 11 speed chain, Campy Chorus 2015 50/34 crank and a Campy Chorus 2015 S2 front deraillure + TRP HY/RD's.

neither should work together - but i does...

Due to the TI cogs on the 10-speed XTR casette the system weight is abouth the same as my road bike 11-29 chorus casette and an chorus deraillure. I havent regreted getting the heavier clutch type 2.x deraillure though - it nevers drops the chain ithe woods or on this summers 1800km Appenine north-south ride - often on non paved roads..

Could you upload the pics of the cable route from the frame to RD XO?

Sent from my SM-N9208 using Tapatalk

reippuert
Posts: 98
Joined: Sat Apr 23, 2011 9:18 am
Location: Copenhagen, Denmark

by reippuert

tbar23 wrote:
Sun Sep 18, 2016 4:13 pm
Thanks all. I'm not convinced that 1:1 is low enough. That would put my average cadence around 65 rpm for 90 minutes. I'd really rather be higher than that.

@reippuert - I got similar advice from a buddy. He recommended an 11-42T 11-sp Shimano XT cassette with either Sram X7 or X9 long cage RD (10-speed). He said that is a fairly common CX setup. I think it might add more than 200g, though. It is a relatively inexpensive option, though ... so might be worth a try.
I just modded an 11speed 11-40 STX cassette for a 2nd wheelset (got tired of swapping 43mm Gravelkings and 35mm Compass Extralight as i only run tubeless).

That gives me 50/34 with a very nice evenly spread 10 speed casette at 13-15-17-19-21-24-27-31-35-40, especially the lowend cogs now has a very evenly spreaded gain ratio.

Swapped the stock 2.15mm 11 speed with 2.35mm 10 speed spacers (last 31-35-40t is one piece though), removed the stock 11t and 13t cogs and installed a 10speed 13t fromm a junior casette with build-in spacer. Its not dead on in regs to shifting like with the pure 10 speed XTR casette, but it still works and in chain length is ok as long as i avoid 50-40t which would be stupid anyway.

The modded 11speed SLX cassette is signicantly heavier than the 10 speed XTR, but the new whelset (DT X1700 with 43mm GK's) is also way heavier than the other wheelset (35mm Compass Extralights on DT 460db rims and DT 180 hubs). 40t cog compensates for the heavier wheelset with 44mm tyres as opposed to 35mm's (those 9mm actaully eats up half a gear on the low end).

Considdered the 10 speed Shimano Deore 11-42 casette but gain ratio is just absurdly unevenly spread and weight of that casette is gigantic. Also considered the leight weight version of 11-40 10 speed from Sunrace but it cost almost twice as much as the STX and gain ratio was alsmost as uneven as the Shimano Deore 11-42

An 11 speed 14-15-16-17-19-21-24-27-31-35-40 with 50/34t and 700cx44mm tyres would be a very interesting cassette though - but i already have the 10 speed Chorus Ergo levers and i love the ergonomics.
Last edited by reippuert on Fri Feb 16, 2018 4:11 pm, edited 1 time in total.
--
mvh. Morten Reippuert Knudsen @Merlin Works CR, Chorus 15, Reynolds 46/66

by Weenie


Marin
Posts: 2815
Joined: Wed Jan 22, 2014 11:48 am
Location: Vienna Austria

by Marin

Wouldn't you be better off getting smaller chainrings?

A 14-40 has a smaller range than an 11-32 that weighs a third.

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