Originally Posted by
XXLHardrock
I'm using a Road Link on my road bike with a 12-40 cassette and 50/34 up front and it works just as intended.
The device does not make up for lack of capacity of the 105 GS but does put the RD in a position to shift onto the 40 tooth cog. I just can't shift a 50/40 combo.
If I'm reading this right, aside from the total chain wrap capacity, you are saying your chain is not long enough to safely shift to the 50/40 combination. I would always cut the chain long enough to accommodate the big/big combination and sacrifice the small/small combination because of the chain wrap limitation.
Neither combination is advisable, but the likelihood of forgetting not to use the big/big combo is much greater and the consequences can be a long walk home followed by an expensive repair. I generally never come anywhere close to using my small/small combination anyway. YMMV.