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Are there any issues with running sliding dropouts slammed to the rear position?
I have a Pipedream Sirius and I may want to do this. A google image search of Sirius and Moxie's shows plenty set up like this and I'm guessing it's fine
However, I have a Soma Wolverine with sliding dropouts -- albeit different ones -- and Soma do recommend against this as it risks the chainstay cracking
Here's the new Sirius dropouts; my older ones are the same I think
“Soma do recommend against this as it risks the chainstay cracking”
This strikes me as very poor design!
Theoretically, no. In practice...
Interesting that you bring up the Soma Wolverine, as that was my first thought when I read the thread title - the early models had a tendency to break when people started putting chunkier tyres in, i.e ran the dropouts all the way back. They resolved this (and were quite good with warranties, owning up to their mistake I guess) and it's not a problem with newer ones. (EDIT - re: above post: I think they just leave that on their site in a "just in case America litigation" type thing. I asked them about that when I did some work with them as it didn't fill me with confidence...)
If the bike has been designed well, you shouldn't have an issue (I'm not overly au fait with Pipedream). And if you do, you were hardly using it outside of its remit were you?
Yea, I have read that Soma did mess up the design on the earlier ones; fortunately mine is a newer one
The confusing thing to me is that it was the earlier Wolverine's that used the very common Paragon dropouts (orange below), which look pretty similar to my Pipedream ones, while the later ones use an IRD thing I've not seen elsewhere (blue below)
I mean, Soma's solution of having the seatstay meet the dropouts halfway along their length makes a lot of sense, but most other ss frames don't seem to do this
To add to my previous comment, the Moxie and Sirius are designed to be able to be ridden hard. The Moxie (which I have) can take a 170mm fork! I would be astounded if it can’t handle being ridden to its limits with the dropouts all the way back, especially as fast and rough trails are when the longer chainstays feel best.
I'd agree with the above... it's very poor design/manufacture if you can't.
With this in mind, I would be cautious if running a design that I already owned that has known problems.
while the later ones use an IRD thing I’ve not seen elsewhere (blue below)
Those look very much like the ones on my lynskey. Obviously being a lynskey there's a very good chance they will crack/spontaneously burst into flames/teleport me to an alternative dimension at some point but it's done in none of those things in 10 or so years*.
It was consistently right back ish when run single speed.
*having said that, this place occasionally and multiple conversations with customers each do make me doubt the last, but how would I know?
I would be incredibly surprised and disappointed if I could not run the wheel in any position allowed by the slider range. Ditto if the shortest position was unusable for tyre rub for example (which I have also seen even with quite small tyres!)
@DanW, yes, that's what I thought. It would be a strange design if so. It's only the Soma warning that had me thinking
Along with the fact that, to the eye, my dropouts do look quite strange and torque-y slammed rearwards
@dangeourbrain, the blue one's look like your Lynskey? I've only ever seen the Paragon style ones on those frames