How to determine if your RockShox SIDs are "A" or "B"

[possum-magic]

I'm trying to order in a Service Kit for my RockShox SID RL 100mm 29er forks (2012). When I go to the most recent spare parts catalogue on the SRAM website, they list two different types of SID fork - a SID A and a SID B. Apparently the difference is with the inside diameter of the upper tubes. But of course without pulling my fork apart, this is not easy to establish.

So, I wanted to know if anyone out there can tell me if there is another way of determining what type I have from an external inspection of the fork. I have heard the following:
1. SID B have the 80, 100 and 120mm graduations on the stanchions, whilst the SID A only have 80 and 100mm graduations
2. The SID A type are the World Cup variety, which are only made in 26".

Interestingly, I only have 80/100mm graduations on my stanchions, and mine are not World Cup versions, so based on the above to criteria I'm none the wiser!!

[cobba]

How well do you want to service the fork?

If you just want to change the seals/wipers and o-rings the Basic Service Kit works on both model forks.

Basic Service Kit
Part # 00.4315.032.080 is for the 80/100mm model and the 80/100/120mm model.
http://www.bike-components.de/products/info/p32228_Service-Kit-SID-Basic-ab-Modell-2008-.html

Complete Service Kits
Part # 11.4015.300.000 is for the 80/100mm model only.
http://www.bike-components.de/products/info/p31958_Service-Kit-SID-Complete-ab-Modell-2008-.html

Part # 11.4015.494.000 is for the 80/100/120mm model only.
http://www.bike-components.de/products/info/p33971_Service-Kit-SID-Dual-Air-bis-Modell-2012-.html

[possum-magic]

I was looking to get the full service kit to suit my fork. As you have rightly pointed out, there are two to choose from - the 80/100mm (or SID A) version and the 80/100/120mm version (or SID B) version. The question then became "which one do I get??"

After speaking with about 5 different people regarding this, I have the correct answer for my particular fork. That is, ANY SID 29" fork is of the SID B type, as they only made the SID A in 26". If you have a 26" SID fork, its more complicated. Things to look for are:
- hose clamp for securing disc brake hose (refer to part 6 on page 35 of the 2013 RockShox Spare Parts catalogue) means its a SID B. The SID A were supplied with 4 smalls studs for guiding a cable tie
- Year of manufacture. Apparently SID B only came into existence from 2010, so if your fork is earlier than this it will be SID A
- Solo Air forks are SID B only
- SID A are 100mm maximum. Any fork with 120mm travel will be SID B. To further confuse this, a 100mm travel SID B can quite easily be configured to 120mm, even if its been sold as a 100mm fork.
- SID A are only QR. You can't get SID A as 15mm bolt-through

Clear as mud