Shimano new chain length manual

Discuss light weight issues concerning road bikes & parts.
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ooo
Posts: 445
Joined: Sat May 21, 2016 12:59 pm

by ooo

RD-R9100/R8000 manual: "add 1 to 3 links to set length of the chain"

RD-9000/6800 manual: "add 2 links to the “minimum number of links that can be connected”

Calculation results for different setup examples:

chainstay=405 big chainring=52 rear cog=28 unrounded ss chain length=52.11
RD-R9100/R8000 manual: 53 or 54
RD-9000/6800 manual: 54

chainstay=415 big chainring=52 rear cog=28 unrounded ss chain length=52.89
RD-R9100/R8000 manual: 54
RD-9000/6800 manual: 54

chainstay=425 big chainring=46 rear cog=28 unrounded ss chain length=53.08
RD-R9100/R8000 manual: 54 or 55
RD-9000/6800 manual: 55
Attachments
newchain.gif
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TobinHatesYou
Posts: 620
Joined: Mon Jul 24, 2017 12:02 pm

by TobinHatesYou

The small-small / Campy method is still better since it defines your max possible chain length.

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Nefarious86
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Joined: Sun May 25, 2014 4:57 am
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by Nefarious86

TobinHatesYou wrote:The small-small / Campy method is still better since it defines your max possible chain length.
Exactly, why re invent the wheel? If your derailleur is the corect model for the ratios used then small small is simples.
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kode54
Posts: 1102
Joined: Tue May 23, 2006 9:39 pm

by kode54

with Di2, i can no longer shift into small small. new firmware prevents cross chaining. so maybe that's why they went to big big since you can shift into that combo without synchro shift activated.
- AX Lightness Vial EVO D + DA9150 + Enve SES 3.4 carbon hubs
- Parlee Altum + DA9150 + Enve SES 4.5 carbon hubs
- Parlee ESX + DA9150 + THM SRM PM + Enve SES 6.7 CK hubs
- Independent Fabrication Ti FLW + DA9100 + Enve 3.4 CK hubs

ooo
Posts: 445
Joined: Sat May 21, 2016 12:59 pm

by ooo

You can try small-small method on di2 with cross chainring protection using temporary washer between RD and dropout
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