LEWIS ALU 3-Bolt Aluminum MTB Chainring for SRAM 3-Bolt Mount

Gearing tends to be the reason people swap rings, and the LEWIS ALU 3-Bolt gives SRAM 3-bolt crank owners a useful spread, from a 30T climbing ring up to a 38T. The real question is how far to go.

Thinking About Gearing Before Anything Else

Consider where you run out of gears now. If you often spin out on fast descents, a move toward 34T or 38T may help; if you are walking climbs, 30T or 32T is the kinder direction, and it is often worth changing just two teeth at a time before going further.

Where 36T and 38T Sit in the Range

Larger sizes split in an unusual way on this ring. The 38T comes at 3mm or 6mm offset, like 30T, 32T and 34T, yet 36T is only stated at 0mm offset, so going one size up from 34T may mean a different chainline too. Check both numbers together.

Frame Clearance and Chain Length With Bigger Rings

As general guidance, a larger ring needs room around the chainstay and may need more chain. Before committing to 38T, check the clearance at your frame, the capacity of your rear derailleur and the length of your chain, as these points depend on your bike and are not stated for this ring.

• Confirm your crank uses the SRAM 3-bolt mount, as other patterns are not covered.
• Work out whether 30T, 32T, 34T, 36T or 38T suits you, then ask which size is supplied.
• Match your chainline with 3mm, 6mm or 0mm offset.
• Check frame clearance before fitting a 38T.
• Confirm your chain, since compatibility is not stated.

Whichever size you settle on, the body is CNC machine cut 7075 aluminum with a hollow support structure, positive and negative tooth design and a hard-anodized coating, stated as three times harder than the standard kind. Ask which tooth count and offset is supplied before ordering.

Technology

CNC Machine Cut 7075 Aluminum

Smooth Crafted Surface and High precision made

SRAM 3-Bolt Style

Support SRAM 3-bolt crank

Hard Anodized Wear-Resistant Coating

Hard-anodized coating, three times harder than standard anodizing

Positive and Negative Tooth Design

Consider chainrings with a positive and negative tooth design for better chain engagement, contributing to smooth and rapid gear changes.

Lightweight Hollow Design

Lightweight while maximizing the strength of the toothed plate, making it suitable for more intense riding situations.

Specifications