It's far too late but if someone else has the same question, I am running a 36T chainring on a boost frame with a non-boost 6 mm offset, and there is plenty of room with the chain stay. So yes, don't worry !

My experience with the same cassette: the rivets broke while sprinting, resulting in me having to came back by feet. Bad design, period.

Quote from: ilyamaksimov on August 22, 2022, 02:27:37 AM
the feeling that the frame is bending can come from using a stem longer than 50mm. From using a 51mm offset fork. Due to the 66-degree head angle with a long stem and large fork offset, the bike becomes over-steered, giving the feeling of a flex frame. The front triangle is very rigid. The rear may have some suppleness, but you don't feel it when driving.

Thanks to all of you for your reply. I have a 120 mm SID with 44 mm offset and a 60 mm stem. I have never experienced such a feeling with my On one scandal and its 64° HA (because I run a 140 mm fork) and same 60 mm stem. However, when riding, the HA decreases on a hardtail which is not the case on a full susp due to shock compression, so you may get a point. Anyway it's right that the difference in front triangle stiffness is subtle when being static and cannot explain entirely my feeling. I will try a shorter stem, I have never thought it could give such a feeling.

Hi, I have bought a fm936 size L, normal lay up and feel like there is a lack of stiffness in the front triangle : it wiggles significantly more than my other bikes when pushing left right with the bar. I have not read any complain about this anywhere. I have changed the fork for a 35 mm, but still have a strange feeling in the turns that came from this lowish stiffness I think. I have a on one scandal definitively stiffer.

Am I the only one feeling this ? I start thinking that my frame has an issue.

To give the end of the story : 38 mm imperial style shock mounted thanks to a 12.7x55 mm titanium axle threaded at both ends to M10x1.0, gives, fully compressed, 10 mm of clearance between seat stay brace and seat tube.

Remember the ratio of about 2.5 when considering a shock stroke... 42.5 defenetively means that you believe in never bottoming out the shock (at least on my L size frame).

I will let you know in 2-3 weeks how it rides with such old shock (Fox rp23).

I am machining an axle, similar to this one : https://service.dirtlabs.com/product/trunnion-mount-adapter-kit/

Quote from: Colt__Seavers on July 21, 2020, 01:04:08 AM

Thanks again. I'll definitely measure everything when my frame arrives.

How to use a non-trunnion-mount?

I just give fact: on my frame, with a 42.5 or may be 43.5 or 41.5 if my measurement is not correct, the brace between the seat stays hit the seat tube (you misunderstood my post, I never talked about tire, but possible things between the brace and the seat tube, like mud).

It depends on the shock/frame/pressure/riding style if there is a risk or not. If not, fine, may be the suspension kinematics is progressive enough that it is not possible to bottom out.

FYI, I will use a non trunnion shock with 38 stroke, because I have it, and I do not like this trunnion mount style (am I the only one thinking that an aluminum bolt should play the role of the axle?).

Quote from: Medico on July 20, 2020, 07:24:59 AM
Read this topic...please.... There are several people (incl me) riding the bike in size medium and large with a 42.5 shock without any problems.
And mudproblems? It's not a tyre clearence problem.

But I dont think there will be much difference between 100mm travel and 105/110mm...so pick a shock pricewise.

Hi, this is my first post here, I have followed and read the entire post, and I have finally received my FM 936 frame this week.

Concerning the shock stroke question, I have measure a length around 122 or 123 mm eye to eye for full compression (when there is contact with the seatube). So it corresponds exactly to a 42.5 mm stroke. Thus, it does not sound very safe to use such a stroke, since in case of bottom out with some mud on the seat tube or frame deformation it will hit the seat tube.

I have also measured the actual travel, it is indeed around 100 mm (vertical) for 40 mm stroke.

Moreover, frame weight in size L, normal layup is 2.095 kg including rear axle.

Finish quality is very, very good. Geometry seems accurate, in particular I have measured the front center around 800 mm which is what I am looking for. The seat tube is indeed very steep, I was hoping that the actual angle for my saddle height (800 mm on top of saddle) would allow me to use a normal seatpost, but I think I will need a setback seatpost (I like to have the nose of the saddle around 8 cm behind the BB).