A little help needed....Cassette spacing
Discussion
Hi all, I have found myself with a slightly unusual issue that I'm after some help with. Hopefully, the wide knowledge of this group can help me.
I recently bought an SL5 Tarmac pro disc, love the bike and all is well. The issue has come when I've put the bike onto my Wahoo kicker V5. The cassette on the wahoo just doesn't line up with the derailleur and rubs and skips all over the place.
A heavy amount of digging online has found that the SL5 has an offset cassette to allow for disc breaks. This was the first model that specialized did this (Lucky me) and therein lies the issue. This article talks about this specifically - https://www.bikeradar.com/reviews/bikes/road-bikes...
So when I put the bike on the trainer, I can't get the cassette to align with my Ultegra DI2 due to the SCS hanger and the 2.5mm offset.
So now I'm trying to problem-solve. Do you think I could put a 2.5mm spacer behind the 11-speed cassette on the wahoo? I'm just not sure if I would be able to lock that cassette in place if I did. Or maybe could I lose a ring on the 11 speed then add a spacer? I've emailed Wahoo but I'm yet to hear back.
I have thought about changing the hanger on the bike however I don't fancy going down this route through fear of dropping the chain and damaging things.
Really appreciate any input from you all.
I recently bought an SL5 Tarmac pro disc, love the bike and all is well. The issue has come when I've put the bike onto my Wahoo kicker V5. The cassette on the wahoo just doesn't line up with the derailleur and rubs and skips all over the place.
A heavy amount of digging online has found that the SL5 has an offset cassette to allow for disc breaks. This was the first model that specialized did this (Lucky me) and therein lies the issue. This article talks about this specifically - https://www.bikeradar.com/reviews/bikes/road-bikes...
So when I put the bike on the trainer, I can't get the cassette to align with my Ultegra DI2 due to the SCS hanger and the 2.5mm offset.
So now I'm trying to problem-solve. Do you think I could put a 2.5mm spacer behind the 11-speed cassette on the wahoo? I'm just not sure if I would be able to lock that cassette in place if I did. Or maybe could I lose a ring on the 11 speed then add a spacer? I've emailed Wahoo but I'm yet to hear back.
I have thought about changing the hanger on the bike however I don't fancy going down this route through fear of dropping the chain and damaging things.
Really appreciate any input from you all.
Scoobyshue said:
Can't you just reset the limit screws on your mech?
You would need to alter the shift cable length too surely?Losing one cog and shifting the cassette using spacers must work, but I'd guess it would be better to lose the big cog, you might still want to alter the limit screws to prevent shifting off the end?
You might find a rear cassette where the 'spider' holding the bigger cogs can be modified to shift the cogs across relative to the hub splines?
Is it possible to space the frame across on the trainer?
Having bought an SCS Diverge I know all about the frustration in getting wheels for this format #maddening
But are you sure your Tarmac is SCS? I ask because it was they only made it a thing for a handful of model years and I dont recall the Tarmac being one of the bikes they kitted with it
Cheers
It's the other way around from what you say, isn't it?
Specialized has moved the cassette inboard to maintain the chainline with shorter stays, therefore you'd need to move the cassette closer to the centre of the wahoo, not space it out? The only way to do this would be to get 2.5mm machined off a cassette (fairly common in timetrialling when people convert 11speed cassettes for use on 10speed freebodies on old disc wheels) and then potentially a 2.5mm spacer between the smallest sprocket and the lockring unless there's enough tolerance to get away without one.
ETA: you could probably also achieve the same by working out how much a sprocket and spacer take up, subtracting 2.5 and adding a spacer of that width to the back of the cassette and making it 10 speed (although you run the risk of sending the chain off the top of the cassette unless you adjust the limit screws everytime you put the bike on the turbo). I'd probably try this first to check it works before then getting a cassette machined to get 11 gears back.
Specialized has moved the cassette inboard to maintain the chainline with shorter stays, therefore you'd need to move the cassette closer to the centre of the wahoo, not space it out? The only way to do this would be to get 2.5mm machined off a cassette (fairly common in timetrialling when people convert 11speed cassettes for use on 10speed freebodies on old disc wheels) and then potentially a 2.5mm spacer between the smallest sprocket and the lockring unless there's enough tolerance to get away without one.
ETA: you could probably also achieve the same by working out how much a sprocket and spacer take up, subtracting 2.5 and adding a spacer of that width to the back of the cassette and making it 10 speed (although you run the risk of sending the chain off the top of the cassette unless you adjust the limit screws everytime you put the bike on the turbo). I'd probably try this first to check it works before then getting a cassette machined to get 11 gears back.
Edited by AyBee on Wednesday 11th May 23:36
Thanks for the comments all, looks like I'm not the only one who has had this annoying issue in the past.
As you mentioned, yes I have this the wrong way around regarding the cassette on the trainer now sitting too close to the frame versus how it sits on the wheel.
I'm going to see if I can find some washers that would allow me to space the derailleur side of the frame out enough without causing bending to the frame. I'm hoping the 2.5mm hanger measurement is what's needed. Getting one with the right dimension for the trainer could be tricky though.
Yes, the other option is to just use it in erg mode and I mostly do. However, I really enjoyed some of the zwift courses and races so finding a solution to allow me to use my gearing would be ideal.
As you mentioned, yes I have this the wrong way around regarding the cassette on the trainer now sitting too close to the frame versus how it sits on the wheel.
I'm going to see if I can find some washers that would allow me to space the derailleur side of the frame out enough without causing bending to the frame. I'm hoping the 2.5mm hanger measurement is what's needed. Getting one with the right dimension for the trainer could be tricky though.
Yes, the other option is to just use it in erg mode and I mostly do. However, I really enjoyed some of the zwift courses and races so finding a solution to allow me to use my gearing would be ideal.
So, a little update on the story. It looks like I've fixed the issue by changing the non drive side wahoo spacer around to 130mm, then adding an additional spacer on the drive side between the quick release and the cassette. No rubbing on the washer and the gears now all align and work.
I had emailed wahoo and they really couldn't help, I might send them my solution to see if they approve
I had emailed wahoo and they really couldn't help, I might send them my solution to see if they approve
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