Hi, i recently got a 2023 Orbea alma h30 which comes with a SR RAIDON 32 RLR 100mm Boost. I found a store selling RockShox SID SL Ultimate Race Day 29 100mm for only 450€. Seems like a very good deal to me but i just want to make sure the fork is compatible before i pull the trigger.
The forks have the same length and offset (100mm, 44offset)
The rockshox is for 1.5 tapered steerer and my bike has 1-1/8 – 1-1/2″ which i believe is the same thing?
The rockshox has a 15×100 axle and i am not sure what my current bike has. The bike wont arrive for another couple of days so i cant get out and measure and i cant see it anywhere on the orbea website.
Is there any other measurements i need to check for compatibility? Thanks for any help!
[Fork specs](https://www.sram.com/en/rockshox/models/fs-sids-ult-c1)
[Bike spec](https://www.orbea.com/se-en/bicycles/mountain/alma/cat/alma-h30-2024)
by Olllin
1 Comment
You sure the Rockshox is 15×100 and not 15×110?
Boost spacing is 15×110 for the front and most certainly what the Orbea will have (confirmed, it says Boost on the listing). If the Rockshox is really 15×100 (old non-boost spec) it won’t work with your front wheel.
For what it’s worth Boost is more common than not and the fork you linked is boost (15×110) according to the specifications.