TC Bros. DIY Round 5″ Oil Tank

A TC Bros. stainless steel pipe kit for Triumph and Harley models, complete with a nut and bolt.

A **TC Bros DIY 5 inch Pill Style Universal Chopper Oil Tank Kit** consisting of a set of stainless steel parts ideal for custom chopper/bobber motorcycles.

A set of TC Bros DIY 5 inch Pill Style Universal Chopper Oil Tank Kit and fittings for a custom chopper/bobber oil tank.

A set of TC Bros. metal balls and a set of TC Bros. bolts, perfect for the TC Bros DIY 5 inch Pill Style Universal Chopper Oil Tank Kit or TC Bros DIY oil tank kit. Ideal for Harley enthusiasts.

$99.95

Type

Flat

Pill

Low stock - 1 item left
Inventory on the way

[{"id":49537626013889,"title":"Flat","option1":"Flat","option2":null,"option3":null,"sku":"105-0150","requires_shipping":true,"taxable":true,"featured_image":{"id":32138931732673,"product_id":10811264073921,"position":2,"created_at":"2022-04-04T23:06:52-04:00","updated_at":"2025-09-12T16:16:26-04:00","alt":"A TC Bros. stainless steel pipe kit for Triumph and Harley models, complete with a nut and bolt.","width":800,"height":800,"src":"\/\/tcbros.com\/cdn\/shop\/products\/105-0150_1.jpg?v=1757708186","variant_ids":[49537626013889]},"available":true,"name":"TC Bros. DIY Round 5″ Oil Tank - Flat","public_title":"Flat","options":["Flat"],"price":9995,"weight":0,"compare_at_price":9995,"inventory_management":"shopify","barcode":"2A1-2","featured_media":{"alt":"A TC Bros. stainless steel pipe kit for Triumph and Harley models, complete with a nut and bolt.","id":24435805782209,"position":2,"preview_image":{"aspect_ratio":1.0,"height":800,"width":800,"src":"\/\/tcbros.com\/cdn\/shop\/products\/105-0150_1.jpg?v=1757708186"}},"requires_selling_plan":false,"selling_plan_allocations":[],"quantity_rule":{"min":1,"max":null,"increment":1}},{"id":49537625653441,"title":"Pill","option1":"Pill","option2":null,"option3":null,"sku":"105-0137","requires_shipping":true,"taxable":true,"featured_image":{"id":32138686431425,"product_id":10811264073921,"position":4,"created_at":"2022-04-04T22:24:17-04:00","updated_at":"2025-09-12T16:16:26-04:00","alt":"A set of TC Bros DIY 5 inch Pill Style Universal Chopper Oil Tank Kit and fittings for a custom chopper\/bobber oil tank.","width":800,"height":800,"src":"\/\/tcbros.com\/cdn\/shop\/products\/105-0137_1.jpg?v=1757708186","variant_ids":[49537625653441]},"available":true,"name":"TC Bros. DIY Round 5″ Oil Tank - Pill","public_title":"Pill","options":["Pill"],"price":11995,"weight":0,"compare_at_price":11995,"inventory_management":"shopify","barcode":"8G2","featured_media":{"alt":"A set of TC Bros DIY 5 inch Pill Style Universal Chopper Oil Tank Kit and fittings for a custom chopper\/bobber oil tank.","id":24435558580417,"position":4,"preview_image":{"aspect_ratio":1.0,"height":800,"width":800,"src":"\/\/tcbros.com\/cdn\/shop\/products\/105-0137_1.jpg?v=1757708186"}},"requires_selling_plan":false,"selling_plan_allocations":[],"quantity_rule":{"min":1,"max":null,"increment":1}}]

Hassle-free 90 Day Returns

Free USA Shipping for Orders Over $99*

Free Tech Support M-F 8:30am-4:30pm EST

Fast Shipping—No Backorders, No Drop Shipping, No BS

Product Videos

TC Bros. DIY Round 5″ Oil Tank

The size and shape of factory oil tanks often means they can't be reused without lots of fabrication, especially when used on a motorcycle that's been converted to a rigid rear. Why not spend your fab time making something custom?

10"L × 5" OD
Oil capacity is nearly 3 quarts
100% TIG welded mild steel
Available with flat or domed (pill-style) ends
Pressure tested to ensure quality, leak free performance
CNC-machined, knurled aluminum cap included (1-5/16"-12)
1/4" NPT CNC-machined bungs included for easy plumbing
Proudly made in the USA (and wherever you complete the work!)

This TC Bros. Round Oil Tank has dimensions that agree with a wide variety of build types from choppers to metric café motorcycles to Britbikes. It has a custom oil bag look that doesn't shout for attention. It's a highly functional reservoir, too, holding nearly three quarts of oil if the tank is assembled at full size, but it's a small enough in diameter to fit even in cramped spaces. The mild steel makes for easy drilling, cutting, and welding.

The tank includes a filler bung and bungs to accept 1/4" NPT fittings to plumb your feed line, return line, and vent. For a simpler installation, a vented filler cap is available separately. (We recommend using the remaining bung for an optional oil drain port.)

Mounting kits (also available separately) are a natural fit for 1982-2003 Harley-Davidson Sportsters that have been hardtailed using a TC Bros. rear section, but this tank and those kits are also very suitable for Harley-Davidson Big Twins and lots of other custom bikes with a traditional backbone and seat tube arrangement.

We strongly recommend pressure-testing these oil bags after welding, fabrication, and mockup. This is standard procedure before applying any final coatings to ensure there are no leaks and proper clearance for fittings and hoses.

Universal mounting for custom applications; heavy fabrication required
A perfect match for TC Bros. Sportster hardtails and very easily adapted to earlier Sportster, most Big Twin, and many metric and British applications

105-0150 Flat Ends

105-0137 Pill (Domed Ends)