8 Speed Cassette 12/34t Index SCM-66 Nickel Sun Race. 8 Speed Cassette 12/34t Index SCM-66 Nickel Sun Race. 8 Speed Cassette 12/34t Index SCM-66 Nickel Sun Race. We carry over 3,000 bicycle parts and accessories. If you have any questions about any of our parts, please send us an email.