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My bike is fairly new (1000 km) however I am worried about accumulation of dirt/scratches on the front fork.
I've looked at Suntour foam rings however could not find anything.
Is this because Suntours do not require maintenance like FOX / Rockshox or is there another reason?
Any half-decent fork requires maintenance, the air variety of XCR not being an exception. True, Suntour does not seem to publish XCR-specific docs compared to other higher priced forks like Auron or Axon, but there's a general fork manual available. Some relevant quotes from it:
MAINTENANCE PLAN
after every ride: Clean the fork tubes and dust seals and maintain with an oily cloth / check stanchion tubes for scratches
every 50 hours: Maintenance 1 (at dealer)
every 100 hours or once a year: Maintenance 2 (at dealer, ideally before winter time in order to protect all parts from the effects of weather by proper greasing)
MAINTENANCE 1:
Check function of fork / check torques of mountings screws and nuts at dropout (10 Nm) / check for scratches, dents, cracks, discolouration, signs of wear and signs of minor corrosion (maintain with oily cloth).
MAINTENANCE 2:
Maintenance 1 + disassembly / cleaning the entire fork inside and out / cleaning and lubricating dust seals and slider sleeves / checking torques / adjusting to the riders liking. Before disassembly, check the slider sleeve play of the fork. To do so, apply the front wheel brake and gently push the bicycle back and forth at the handlebar stem shaft. Replace the slider sleeves if the play is too big (more than 1 mm at the fork brace).
I'd advise to contact the venue you bought the bike from and even SR Suntour itself for further details.
