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I own a Trek Crossrip LTD 2016 edition bike with a SRAM 11-32 cassete in the back. I also recently purchased a wahoo kickr core to go along with the bike. When the bike has the wheel in and not connected to the trainer, I am able to get into the highest cog in the rear cassette, but when I plug it into the trainer it will only shift to gear before the final gear. I am trying to figure out what can be done to get it to shift into the hardest gear.

I took it to my local bike shop yesterday and paid 30 dollars for the mechanic to take a look at it because my efforts to adjust the derailleurs front and back seemed to not help and I noticed there was a tendency to skip gears when I shift. This skipping gears has gone away, but I am still not able to get into the last gear on just the trainer. I verified yesterday before leaving the shop that I was able to shift into the final cog in the street.

Both Cassettes are 11-32 SRAM with the only difference being the cassette on my trainer is a 1030 model vs a 1050. I am told this is mostly a weight difference.

Also I noticed that between the 4th and 3rd highest gear is where there is a dead shift. For example, if I am in the 4th hardest gear I have to shift twice to get to the 3rd. Then the final shift gets me into the 2nd. There are then no more shifts to take me to the first.

Should I not worry to much about this and use it as is? I would like to use the full range of gears on the trainer if possible. Is it possible that the indexing could need to be reworked or that a dirty cassette could be the issue? My bikes cassette is quite dirty, but I am hesitant to clean it if that means I need to re-index everything.

Thanks in advance for taking the time to help me with this.

Update: I decided to ride it a bit and discovered that the chain skips over the top back jockey wheel to make a clicking noise. I took a photo/video of it and will update a link shortly for those interested.. Going to put the main wheel back on after that and see if it has the same issue.

Update: I put my normal wheel back on, I don't hear the clicking of the jockey wheel, but I see the chain skipping.

Update: Here are images/video. My cat photobombed

https://drive.google.com/file/d/19sZimEvZ4Lr4QODWwqeLaavduzU4_Go1/view?usp=sharing, https://drive.google.com/file/d/1BfDo7MmizYbC8wVO8IV_xtwoB9JVxw-u/view?usp=sharing, https://drive.google.com/file/d/1JPCbQodQEJ_ItYOGOuSAWbUqeCS_cF8p/view?usp=sharing, https://drive.google.com/file/d/1L9MoBYhuimpJgd9MZF3tdE2wKH15PTHX/view?usp=sharing

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  • So you are unable to adjust the rear derailleur on the trainer so that it shifts to the smallest sprocket? I.e. you screw the limit screw completely out, cable is slack and it still doesn’t shift to the smallest sprocket?
    – Michael
    Apr 27, 2021 at 6:57
  • I could try that, but I just paid a bike mechanic to adjust my derailleur and I am not sure I can get it back to where it is to work on my actual wheel outside. I think at this point I may take the trainer back to REI and see if they can make it work. If not I will return it and just ride the bike outside. I think my bike has larger issues or something the mechanic who worked on it said my front derailleur was bent and he fixed that...
    – Ebay89
    Apr 27, 2021 at 18:20
  • I think there is a slight difference in cassette position between the real wheel and the trainer. I’m not sure you can even get it to work reliably on both. Maybe if you have a selection of very thin spacers and use just the right amount of spacers.
    – Michael
    Apr 27, 2021 at 19:09
  • I am testing re-tagging questions - please don't worry about the delete.
    – Criggie ♦
    Jun 17, 2021 at 23:18

1 Answer 1

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When it's a 10-speed bike involved in this situation, here is the calculus:

  • If someone put a cassette spacer on the trainer wider than the proper 1.85mm 10 to 11 speed conversion spacer, it causes this problem because then the small cog is out further than the RD high limit screw is set for it to be.
  • If the trainer does have a 1.85mm spacer and still doesn't work, and both cassettes have any included 1mm spacers on that they came with, the assumption then becomes the hub is locating the small cog in further than standard, which is why using the techncially right spacer on the trainer is seeming to put the small cog out to far. The solution then becomes use a thinner spacer on the trainer.

Make sure your hanger alignment is perfect.

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  • Hi, thanks for the response. I did include the spacer, but initially I had REI install it since I bought both together and the mechanic did not put it in. I also put in the hub adapter. I found another issue that sounds related to the hanger alignment... I am going to add more to my original post with video and photos.
    – Ebay89
    Apr 27, 2021 at 0:45
  • Sorry I just reread what you wrote, there is a spacer that came with the cassette. That one is most likely missing and may be the problem
    – Ebay89
    Apr 27, 2021 at 0:51

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