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Mechanics Quick Question Thread [Ask Questions Here]
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flag gabriel-mission9
Posted: May 23, 2024 at 16:11 Quote
riish wrote:
Nah, 6902’s are radial contact bearings, and the correct seal (red side) is facing outwards on both.
I’ll take it for a ride and see if the preload has increased again after that.

The tiniest amount of "not pushed in far enough" can cause serious notchyness when the axle is tightened, without causing any noticeable axle play with the wheel removed.

I will often heat the hubshell and cool the bearings when fitting new bearings. You dont need to go crazy with it, and in fact want to avoid getting the hubshell excessively hot, so don't blast it with a 600degree heat gun or anything. Boiling water on the hubshell and bearings in the freezer is plenty hot/cold enough. Just make sure no moisture is trapped in there if you use this method. Usually bearings will press in very easily with this heat differential, making it simpler to make sure they are fully home.

If the wheel still tightens up a touch when assembled onto the bike, my next (admittedly slightly ham fisted) step is usually a sharp blow on the end of the axle (with everything fully installed on the bike and tightened up) with a rubber mallet. This usually does the trick. The shock load through the hub "persuades" the bearings to settle into their final resting place and everything magically frees up.

If the wheel is still notchy after that, then somethings probably not right and you'll need to investigate further.
flag jimbomodder
Posted: May 24, 2024 at 5:31 Quote
Ok not sure right thread but I'm looking to get a new bike through work and my budget is £1500, I've been biking since is was 13 (38 now) and I want to get back into it properly like trails/dh/DJ so I'm currently torn between 3 bikes. 1) Cannondale habit ht1 @1400. 2) Merida Big trail 600 @ 1175 and 3) GT zaskar at 829. All are 2023 bikes and id be using the extra left over for upgrades on each bike. I'm just not sure which especially which would be easier to maintain. I know the GT is cheapest but also has sram sx parts and the horrible truvativ powerspline bb( lots of bad experiences) this isnt my 1st 29" as had the big trail 500 last year but got stolen just after Xmas so been back on my old 2007 cove stiffee.
flag barp
Posted: May 24, 2024 at 8:26 Quote
jimbomodder wrote:
Ok not sure right thread but I'm looking to get a new bike through work and my budget is £1500, I've been biking since is was 13 (38 now) and I want to get back into it properly like trails/dh/DJ so I'm currently torn between 3 bikes. 1) Cannondale habit ht1 @1400. 2) Merida Big trail 600 @ 1175 and 3) GT zaskar at 829. All are 2023 bikes and id be using the extra left over for upgrades on each bike. I'm just not sure which especially which would be easier to maintain. I know the GT is cheapest but also has sram sx parts and the horrible truvativ powerspline bb( lots of bad experiences) this isnt my 1st 29" as had the big trail 500 last year but got stolen just after Xmas so been back on my old 2007 cove stiffee.

You might get more answers over on this thread:

https://www.pinkbike.com/forum/listcomments/?threadid=118115
flag jimbomodder
Posted: May 24, 2024 at 9:20 Quote
barp wrote:
jimbomodder wrote:
Ok not sure right thread but I'm looking to get a new bike through work and my budget is £1500, I've been biking since is was 13 (38 now) and I want to get back into it properly like trails/dh/DJ so I'm currently torn between 3 bikes. 1) Cannondale habit ht1 @1400. 2) Merida Big trail 600 @ 1175 and 3) GT zaskar at 829. All are 2023 bikes and id be using the extra left over for upgrades on each bike. I'm just not sure which especially which would be easier to maintain. I know the GT is cheapest but also has sram sx parts and the horrible truvativ powerspline bb( lots of bad experiences) this isnt my 1st 29" as had the big trail 500 last year but got stolen just after Xmas so been back on my old 2007 cove stiffee.

You might get more answers over on this thread:

https://www.pinkbike.com/forum/listcomments/?threadid=118115
Thanks man
flag barp
Posted: May 24, 2024 at 10:36 Quote
jimbomodder wrote:
barp wrote:
jimbomodder wrote:
Ok not sure right thread but I'm looking to get a new bike through work and my budget is £1500, I've been biking since is was 13 (38 now) and I want to get back into it properly like trails/dh/DJ so I'm currently torn between 3 bikes. 1) Cannondale habit ht1 @1400. 2) Merida Big trail 600 @ 1175 and 3) GT zaskar at 829. All are 2023 bikes and id be using the extra left over for upgrades on each bike. I'm just not sure which especially which would be easier to maintain. I know the GT is cheapest but also has sram sx parts and the horrible truvativ powerspline bb( lots of bad experiences) this isnt my 1st 29" as had the big trail 500 last year but got stolen just after Xmas so been back on my old 2007 cove stiffee.

You might get more answers over on this thread:

https://www.pinkbike.com/forum/listcomments/?threadid=118115
Thanks man
Cheers! Salute
flag thedad71
Posted: May 28, 2024 at 4:31 Quote
Hi everyone,

quick question - I see a fair amount of videos of bikers dropping their bikes from shoulder height to the ground to show the suspension absorbing the hit, not bouncing around etc.

My question is this - is this is a fair way of ascertaining the suspension dynamics? ignoring the fact that it is just one drop on a stationary bike and not a complete test. Is the fact that the bike absorbs the hit very well more concerning as there is no rider weight on the bike? surely the addition of the rider weight would make the suspension act differently? I am honestly curious as to the answers.
flag Gravelben
O+
Posted: May 28, 2024 at 4:38 Quote
Its pretty meaningless in my opinion, as you say a bike with the weight of a rider on it will have quite different behaviour to an unloaded bike.
flag barp
Posted: May 28, 2024 at 9:03 Quote
Yeah, the drop test can be good for finding loose parts/sources of noise, but I agree it's basically useless with regard to assessing suspension performance.
flag bunjiman82
Posted: May 28, 2024 at 12:39 Quote
Struggling to figure something out and maybe you guys can help... I run a set of Magura MT trail sport brakes on my bike and want to replace the pads.

I've been told that you can improve on the already excellent performance by switching to 4 single pads in the front 4 pot rather than running the joined twin pads. Can anyone confirm it's possible or worth doing and which pads I would need?

The second part of my question is that Magura don't seem to identify the specific pad sizes for this brake set on their website. I'd like to try swisstop pads but haven't got a clue which of their sizes will fit, so I'm left guessing on appearance. Does anyone know the pads for the 2 pot on the rear? And whether the front caliper is an MT5 or an MT7 or what it is?
flag ethanrevitch
Posted: May 28, 2024 at 13:51 Quote
bunjiman82 wrote:
Struggling to figure something out and maybe you guys can help... I run a set of Magura MT trail sport brakes on my bike and want to replace the pads.

I've been told that you can improve on the already excellent performance by switching to 4 single pads in the front 4 pot rather than running the joined twin pads. Can anyone confirm it's possible or worth doing and which pads I would need?

The second part of my question is that Magura don't seem to identify the specific pad sizes for this brake set on their website. I'd like to try swisstop pads but haven't got a clue which of their sizes will fit, so I'm left guessing on appearance. Does anyone know the pads for the 2 pot on the rear? And whether the front caliper is an MT5 or an MT7 or what it is?
People don’t. Please…don’t switch to the 4 separate pads. It makes centering the pads very very difficult.
flag bunjiman82
Posted: May 28, 2024 at 13:57 Quote
Please…don’t switch to the 4 separate pads. It makes centering the pads very very difficult.

Good to know thanks tup
flag SPSuspension
Posted: May 28, 2024 at 16:16 Quote
thedad71 wrote:
Hi everyone,

quick question - I see a fair amount of videos of bikers dropping their bikes from shoulder height to the ground to show the suspension absorbing the hit, not bouncing around etc.

My question is this - is this is a fair way of ascertaining the suspension dynamics? ignoring the fact that it is just one drop on a stationary bike and not a complete test. Is the fact that the bike absorbs the hit very well more concerning as there is no rider weight on the bike? surely the addition of the rider weight would make the suspension act differently? I am honestly curious as to the answers.

We can say as a suspension specialists that the test is completely worthless! Proper setup dictates a good bike, not if it bounces or not with no load on it. It's like saying "This car drives great!" while the key is off. Bounce test can give some indication of pedal kick back, but even that is suspect with no rider weight. Always start with proper sag- then dial in from there. We are lucky in the US to have a few really good suspension shops out there that can help with the tuning too.
flag gabriel-mission9
Posted: May 29, 2024 at 3:27 Quote
The only real downside to 4 seperate pads in maguras is less pad surface area in contact with the disc. This may lead to poorer heat management

The only real upside would be more consistant pressure along the face of each pad, and the ability to change out pads individually (the leading pads will usually tend to wear faster)

Really I don't consider it a huge tuning tool. Neither option is going to provide significantly better or worse performance, or a significantly harder or easier set-up process. Just run what you've got.

The suspensio bounce test is just social media nonsense. It's a quick way to check your tyres arent dead flat I suppose.
flag leftypumpkin
O+
Posted: May 29, 2024 at 15:54 Quote
bunjiman82 wrote:
Struggling to figure something out and maybe you guys can help... I run a set of Magura MT trail sport brakes on my bike and want to replace the pads.

I've been told that you can improve on the already excellent performance by switching to 4 single pads in the front 4 pot rather than running the joined twin pads. Can anyone confirm it's possible or worth doing and which pads I would need?

The second part of my question is that Magura don't seem to identify the specific pad sizes for this brake set on their website. I'd like to try swisstop pads but haven't got a clue which of their sizes will fit, so I'm left guessing on appearance. Does anyone know the pads for the 2 pot on the rear? And whether the front caliper is an MT5 or an MT7 or what it is?

I run 4 individual pads on my MT5's, you'll need to buy some bolts (or order pads that come with bolts) to hold them in place. Double check to see that the holes exist for the 4 pads so you can insert the bolts (and that they are in fact threaded, mine were). I ordered 'titanium' bolts off of Aliexpress for cheap-cheap.

I've had zero issues with pad centring on my brakes.
flag naptime
Posted: May 29, 2024 at 20:59 Quote
Not a criticism but, what's the idea behind this?

 


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