Bike upgrades or new bike

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DanDeKalb
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Re: Bike upgrades or new bike

Post by DanDeKalb »

(Chrome crashed and I lost the post, so I had to rewrite it...)

Ok, I did a bit more research about this topic and I think I understand it better now. Maybe you'll find it interesting as well, I sure did. And I hope what I wrote here is correct. :D

When looking at fork oil, there are two values you have to look at:
  • viscosity grade (refers to the flow of oil at a certain temperature: 5W, 10W, 15W, etc)
  • kinematic viscosity, measured in centiStokes (refers to the way oil behaves when compressed under pressure, so for damping)
Now we have to look at where the oil is used in the fork:
  • lower leg: "Suspension forks use a unique oil-based lubrication system. The oil pools in the lower part of the fork legs, and from here it helps to lubricate the bushes and seals within the fork, allowing it to move smoothly and without friction."
  • upper tube: for damping movement of the fork, tuning rebound, here's a nice article that explains it better than I can: https://www.pinkbike.com/u/patmcc/blog/ ... uning.html
Ok, now when I put together this information, I can say the following:
  • if I use oil for the lower legs, looking at viscosity grade is enough because it's only used for lubricating
  • if I use the oil for the upper tube, I need to buy an oil that has the centiStoke rating close to the Rockshox OEM oil. Otherwise the fork damping will feel harder or softer.
In conclusion, I will use the oil I bought, it's good for the purpose of lubrication. And when I need damping oil, I'll buy it myself according to the rating.

Here's a diagram onto which I added the oil and the purpose:
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Re: Bike upgrades or new bike

Post by DanDeKalb »

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Re: Bike upgrades or new bike

Post by CDMC »

great job, congrats. see it wasn't that difficult. i hope this fixes the problem
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Re: Bike upgrades or new bike

Post by Maxidyne »

Nice job on the rebuilt! Hopefully it has the result you wanted.
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Re: Bike upgrades or new bike

Post by DanDeKalb »

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Re: Bike upgrades or new bike

Post by DanDeKalb »

As a side topic, my friend is looking for a MTB under 300 euros and he found this:
https://www.olx.ro/oferta/mountainbike- ... 01acceac2e

3x9 speed Shimano Deore XT
Rockshox Tora air fork
Formula Oro disc brakes
26 inch wheels

Is it a good deal? The fork is a bit old but at least it's not Suntour XCT. Thanks.

Or for other options, if you have time to take a look here:
https://www.olx.ro/hobby-sport-turism/b ... dist%5D=10
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Re: Bike upgrades or new bike

Post by CDMC »

looks decent
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Re: Bike upgrades or new bike

Post by DanDeKalb »

Hey guys, I did 2 rides with the fork after servicing, what can I say, it rides like new and I'm very happy with it. So thanks for the advice. :D

The season is mostly over, so I am looking at parts I want to upgrade for next season.
However, I also have a friend who is looking to buy a better bike than he has, so I am considering selling my current bike to him, but I am not 100% sure it would be the best option for me.

Now it's time to compare upgrading vs buying a new bike.
Here's the bike I would purchase: Sprint Apolon PRO 27.5" (price is 550 euros, not in stock right now)
https://sprint-bike.ro/shop/275/345752- ... 97102.html

Advantages compared to my current bike:
Tires: Schwalbe Smart Sam 27.5x2.25
Platform pedals: no name Chinese brand though
9 speed rear cassette+derailleur: Shimano Deore RD-M592 9 speed SGS, Shadow (my current derailleur bounces around - weak springs - and hits the frame, I don't like the sound)
Stem: 75mm stem
New frame geometry (handlebar length, angles, stem), may be more aggressive riding position than my current frame

Improved parts that I don't care about:
Wheels + hubs: may be stronger/smoother than my current ones, don't know
Front derailleur
Headset bearing + bottom bracket bearing: my current ones are Chinese crap and they are rusting. At one point I will have to change them, but for now they are ok.

Things that remain the same:
Fork: Rockshox XC30 (mine is Rockshox 30 Silver, I think they are the same)
Hydraulic brakes: Shimano MT200
Shifters are just as good as the ones I bought for the hydraulic brake upgrade

After selling my bike (for 300 euros maybe? Fair price?), I will probably have to add an extra 250 euros to buy the new one.

Now I want to see how much I need to pay to upgrade my bike close to this level.
Shimano Deore RD-M592 7/8/9 speed SGS, Shadow - 35 euros
Brand name pedals: 25-30 euros
50mm stem: 15 euros
Better tires (Continental or Schwalbe): 40 euros
Total is 120 euros so far.
Compared to a new bike, the difference (130 euros) would account for new wheels, bearings, frame, etc. which I definitely cannot buy for this price.

I have put 430 euros into my bike so far, upgrading would bring the cost up to 550 euros.

What do you think makes sense? Sell to a friend and buy a new one or upgrade my own bike again?
I am considering the upgrade because it's cheaper but I also think I may be able to help a friend out and get a nicer frame/riding position+drivetrain for myself. I haven't tried a different frame so I don't know how big of a difference it can make.

Thanks for the advice. :D
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Re: Bike upgrades or new bike

Post by CDMC »

hey @DanDeKalb im so sorry it took me so long to get back at you(personal life shit), do you still need help with this?
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Re: Bike upgrades or new bike

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