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Grinduro Gear

Old 09-11-17, 10:33 PM
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Grinduro Gear

Hi - I have a 2016 Raleigh Roker Sport that I love, but that I really wish had a lower gear. I looked at older threads but don't quite know how to parse ratio talk when it comes to different bikes and components.

It has a Shimano Tiagra 11-32t and a 46-34t chainrings. Is there a way to just swap out the 34 for a smaller chainring, or do I need to do it on the cassette with a different rear derailleur.

Or both/all three??

Thx.
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Old 09-12-17, 05:02 AM
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Originally Posted by oldspeck
Hi - I have a 2016 Raleigh Roker Sport that I love, but that I really wish had a lower gear. I looked at older threads but don't quite know how to parse ratio talk when it comes to different bikes and components.

It has a Shimano Tiagra 11-32t and a 46-34t chainrings. Is there a way to just swap out the 34 for a smaller chainring, or do I need to do it on the cassette with a different rear derailleur.

Or both/all three??

Thx.
Your 46/34 chain rings are probably on a 5 bolt, 110mm bolt circle diameter crankset. If so, 34t is about the smallest chainring you can find, because any smaller and the bolts would interfere with the teeth (I think if you look, you might be able to find a 33t, but barely worth the hassle).

I would look into a wolf tooth roadlink plus a bigger cassette...it would likely allow you to keep your existing rear derailer.

Last edited by wheelsmcgee; 09-13-17 at 01:22 AM.
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Old 09-12-17, 07:30 AM
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Originally Posted by oldspeck
Hi - I have a 2016 Raleigh Roker Sport that I love, but that I really wish had a lower gear. I looked at older threads but don't quite know how to parse ratio talk when it comes to different bikes and components.

It has a Shimano Tiagra 11-32t and a 46-34t chainrings. Is there a way to just swap out the 34 for a smaller chainring, or do I need to do it on the cassette with a different rear derailleur.

Or both/all three??

Thx.
The Tiagra 4700 GS rear derailleur has the ability to fit a 34t sprocket. So right there you could bump up the cassette size and have easier gearing while still being under the max capacity.

Then, you can always exceed Shimano's stated capacity. I do it for a 5800 105 GS rear derailleur and others do it too. It isnt a big deal to add a couple teeth to the sprocket size. It is a bigger deal to exceed the total capacity, but that isnt an issue for you since its 39teeth for your derailleur(the difference between your front which is 12teeth plus the difference between your back which is 24 if you get an 12-36 cassette. like the SRAM PG 1070. https://www.sram.com/sram/mountain/p...10fm22331gdc9j


If this were me...
- I would just buy a 12-36t cassette(or 11-36 if a 12-36 werent available) and slap it on.
- If the rear derailleur handled the larger cog size without issue, then perfect. If the derailleur needed more space from the rear derailleur, i would adjust the screw. if it still needed more space, i would add a Wolftooth Roadlink(i have one on my bike, actually).
- Then once the setup worked, I would check the chain length to see if it needs to have a couple links added(versus just buying a new chain).

Looks to be a relatively easy fix and you could have 34-34 gearing or even 34-36 gearing to climb up walls...or struggle up hills(like me!).
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Old 09-12-17, 03:16 PM
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Thanks

Really helpful, thanks for the insight.
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Old 09-12-17, 10:12 PM
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For real walls I use my 22x36 gearing. But I'm old and slow.
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