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29er / Re: LightCarbon 918?
« on: January 27, 2024, 04:12:49 AM »
I enquired recently and still no plan to make an extra large size. A shame, as it looks nice!
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29er / Re: Carbonda fm936 Thoughts
« on: January 16, 2024, 01:39:14 PM »
How does the bash guard protect the frame? Doesn’t the chainring do that already?
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29er / Re: Carbonda fm936 Thoughts
« on: December 29, 2023, 02:17:47 PM »
How is everyone doing with long term durability? I have a second hand vitus. It looked immaculate when I bought it, but who knows how much use it had? I since put on about 1000 km before finding a crack in the drive side chainstay.
Sanding back it seems that the carbon on the bottom of the chainsay in this area was poorly consolidated (about 2 cm long). I assume given it was a narrow section that the bladder did not apply good pressure during manufacture. I assume that this is an uncommon issue.
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Sanding back it seems that the carbon on the bottom of the chainsay in this area was poorly consolidated (about 2 cm long). I assume given it was a narrow section that the bladder did not apply good pressure during manufacture. I assume that this is an uncommon issue.
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29er / Re: Carbonda fm936 Thoughts
« on: October 03, 2022, 02:29:07 AM »
Regarding the sag; For me, I need the SID luxe stuffed with volume spacers to get 35% sag at full pressure, which also results in never using the bottom quarter or so of the travel. My hope is that a bigger shock without volume spacers will use more of the travel. The desire to lift the sag into to 25-30% range is due to the extremely low bottom bracket; when tired in an XC race then minimising the need to manage pedal strikes over roots is desirable! If the sag is a bit less, then the bottom bracket is marginally higher. It probably doesn't make much difference, but having low sag makes you mad at those points!
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29er / Re: Carbonda fm936 Thoughts
« on: September 25, 2022, 11:20:18 AM »
Regarding the sag issues on the SID Luxe. There are a lot of assumptions on my part; I am trying to figure this issue out so please correct me if I have anything wrong! The big uncertainty for me is how to understand the impact of the negative spring.
I have taken measurements on a few shocks that I have access to in order to try and compare the area of the piston. I figure this should be proportional to the force the shock produces at a given pressure - but I might be mistaken. I have measured from the outer diameter of the piston seal minus the diameter of the central shaft. For the uncompressed shock, this should mean that to produce the same force as a SID Luxe at its maximum pressure of 330 PSI, a fox DPS would need 290 PSI (max 350) and a RockShox Super Deluxe 230 PSI.
To me this suggests that the SIDLuxe is probably just a bit weedy for the suspension design of the FM936 and taller/heavier riders. It suggests that a fox DPS should be suitable; it should produce ~20% more force at max pressure. I need to work out the impact on equivalent sag at max pressure (taking my current 30-35% for the SID Luxe as a starting point). However, I will probably get a RS Deluxe Nude; I think these are the same basic air can as the deluxe so should have more margin than the DPS and are also one of the cheaper shocks that I have found in 165x40 mm that is remote compatible.
I have taken measurements on a few shocks that I have access to in order to try and compare the area of the piston. I figure this should be proportional to the force the shock produces at a given pressure - but I might be mistaken. I have measured from the outer diameter of the piston seal minus the diameter of the central shaft. For the uncompressed shock, this should mean that to produce the same force as a SID Luxe at its maximum pressure of 330 PSI, a fox DPS would need 290 PSI (max 350) and a RockShox Super Deluxe 230 PSI.
To me this suggests that the SIDLuxe is probably just a bit weedy for the suspension design of the FM936 and taller/heavier riders. It suggests that a fox DPS should be suitable; it should produce ~20% more force at max pressure. I need to work out the impact on equivalent sag at max pressure (taking my current 30-35% for the SID Luxe as a starting point). However, I will probably get a RS Deluxe Nude; I think these are the same basic air can as the deluxe so should have more margin than the DPS and are also one of the cheaper shocks that I have found in 165x40 mm that is remote compatible.
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29er / Re: Carbonda fm936 Thoughts
« on: September 15, 2022, 12:10:04 PM »
Thanks for the replies.
I checked the pressure with my other pump and got pretty much the same pressure. I have used the pumps on another bike and got pretty much bang on the manufacturer's predicted numbers so I don't think they are massively innacurate.
It is interesting that someone else with a SID Luxe has the same issue. It is a physically small shock so I wonder if it produces less force for the same pressure than the others that have been mentioned (smaller area for the pressure to act on?). I don't know if there is a way of finding out this information for different shocks?
I checked the pressure with my other pump and got pretty much the same pressure. I have used the pumps on another bike and got pretty much bang on the manufacturer's predicted numbers so I don't think they are massively innacurate.
It is interesting that someone else with a SID Luxe has the same issue. It is a physically small shock so I wonder if it produces less force for the same pressure than the others that have been mentioned (smaller area for the pressure to act on?). I don't know if there is a way of finding out this information for different shocks?
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29er / Re: Carbonda fm936 Thoughts
« on: September 13, 2022, 01:25:26 AM »
Hi All,
I have a Vitus branded copy of the 936 (last year's model). It has a SID Luxe Shock with a maximum pressure rating of 325 PSI. At 188 cm and 83 kg (around 6'2 and 183 lb) on an XL frame I find that even at the maximum pressure for the shock of 325 PSI I have 30% sag. Whilst this is OK, I would be interested in experimenting with more like 25% sag or possibly adding a 120mm fork (instead of the stock 100 mm) which would shift weight back increasing load on the rear shock.
Is this normal? Are there other shocks that can cope with higher weights and larger riders on this frame design? Whilst I am no racing snake, I am at the shorter end for an XL and not that fat so suprised to run into this issue!
I have a Vitus branded copy of the 936 (last year's model). It has a SID Luxe Shock with a maximum pressure rating of 325 PSI. At 188 cm and 83 kg (around 6'2 and 183 lb) on an XL frame I find that even at the maximum pressure for the shock of 325 PSI I have 30% sag. Whilst this is OK, I would be interested in experimenting with more like 25% sag or possibly adding a 120mm fork (instead of the stock 100 mm) which would shift weight back increasing load on the rear shock.
Is this normal? Are there other shocks that can cope with higher weights and larger riders on this frame design? Whilst I am no racing snake, I am at the shorter end for an XL and not that fat so suprised to run into this issue!
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