Air Top Cap - 35mm Boost - Splined

RockShox Air Top Cap - 35mm Boost - Splined

Product Description

Fork Spring Air Top Cap - 35mm Boost 15x110 (includes splined top cap and valve cover)

  • SID Select/ Select+/ Ultimate 35mm: C1 (2021+)
  • Pike Select/ Select+/ Ultimate: B3-B4 (2020-2022)
  • Pike RCT3/ RCT/ RC: B1-B2 (2018-2019)
  • Lyrik Select/ Select+/ Ultimate: C2-C3 (2020+)
  • Lyrik RCT3/ RC/ RC2: A1-C1/ B1-C2/ C1 (2016-2019)
  • Boxxer Select/ Select+/ Ultimate: C2 (2020-2022)
  • Boxxer: C1 (2019)

*Uses a casette lockring tool

Product Features

  • Axle: 110mm (Boost)
  • Stanchion: 35mm


For spare parts, if they are in stock we will send them out the same day if we receive the order before midday (except weekends). If we receive the order after midday, we will do our best to despatch them same day, but it may be the following working day. Orders placed after 3pm on Friday will be despatched on the following Monday. We normally send spare parts by Royal Mail post (see below or our 'Shipping' page for cost/delivery times).

Forks, shocks and large/heavy orders go by courier. UK deliveries are with DPD Local, for overseas customers it's DPD, FedEx or DHL.  In all cases these are fully tracked services and you'll need to sign for the delivery - please provide a suitable address with extra instructions if necessary.


You may return your order unused, within 14 days for a refund if you no longer require it, provided it is returned with its original undamaged packaging and is unused and unmarked. Please note, we do not refund postage unless items were supplied in error or are faulty.

Picking mistakes do sometime happen. If we supply the wrong part or there are parts missing from your order please let us know within 14 days of receipt so that we can correct the mistake. In the case of picking errors we will refund your postage costs on the returned item.

Faulty goods will be replaced with the same item or a suitable equivalent, as appropriate.

TF Tuned cannot be held responsible for the non-receipt of returned goods so please ensure you use a tracked and/or insured service as appropriate to the value of the goods you are returning.

Customer Reviews

"After cross-threading my top I was searching the interweb for a new one and was directed to these guys. I'm so glad I was. Ordered on a Saturday, (when they're closed) to receiving it on the Tuesday morning. Great detail in the description so you know you're getting exactly what you are after and a speedy delivery service are all you can ask for. I've bookmarked the site so I can hop on when I need anything else. Will definitely be shouting about TF Tuned. Thank you so much for getting me back on the trails so quickly."
Star Rating 5
Staff response...
"Hey Alan, Thanks for taking the time to leave such a cracking review and your kind words. Ruth @TFT"
" A very good and easy online shop, purchased an air top cap splined to replace the old nut style top cap a, quick turn around time got me up and running in no time Found you on GMBN and will buy from you again"
Star Rating 5
Staff response...
"Thanks Keith, really pleased that you had a good shopping experience! Ruth @TFT"

Item: RS11.4018.083.000

Fork Spring Air Top Cap - 35mm Boost 15x110 (includes splined top cap and valve cover)

in stock In stock

£28.00 inc VAT

Home Delivery

UK mainland delivery from £4.00