Top lug for 1" step-through frame - 31.8mm headtube and 25.4mm top tube - 105.2°
F171-105.2Regular price $ 12.95 Save $ -12.95
- A primer on lugs
sku # F171-105.2
Top lug for 1" step-through frames. Works with a 31.8mm headtube and 25.4mm top tube, 105.2°. Steel.
This lug angles the top tube so that it intersects the seat tube at approximately the halfway point.
Step-through bicycle frames give you a similar low standover height to mixte frames but with improved frame stiffness.
29g - Weight is based on a representative sample. Actual weight may vary slightly. Imported.
We carry lugs that fall into three of the four most commonly built types. These are all road oriented lugs, but hey, there aren't any lug police out there, so do what you want. Two of these types work with 1" steerer tubes and two work with 1-1/8" steerers. The terms: standard, oversize (OS), and double oversize refer to the tubing diameter that the lugs will accept. The larger the diameter the tube, the stiffer the tube, and the stiffer the tube, the stiffer the frame. In general if you're building for a cyclist of average build, you can safely go with 1" standard or OS. If the rider is taller and/or heavier, you might want to go with the 1" oversize, or 1-1/8" oversize. If the bike will be used for touring, oversize tubes might be a wise choice. 1-1/8" double oversize lugs go with even bigger tubes. We don't currently carry double oversize lugs.
In these illustrations the main triangle tubes are light blue and the lugs are darker blue. Each lug joins at least 2 tubes, with the BB shell accommodating 4 tubes: a downtube, seat tube, and 2 chainstays. The chainstay size further complicates matters with the BB shell accepting 22.2mm round chainstays or a variety of oval chainstays. Obviously you'll want to make sure that your chainstay diameter and shape matches with the chainstay socket portion of your BB shell.
If an item is damaged or has been sent in error, we will pay for return shipping and replace the item if it is returned within 30 days purchase.
If you ordered the wrong item or changed your mind, you may return the item provided that it is in new condition and within 30 days of purchase. You will be refunded the purchase price minus a 10% restocking fee. The restocking fee does not apply to exchanges.