Quick take
A bare frame is the hardest part of a build because it locks in wheel size, brake style, and riding position before you buy a single component. These four bicycle frames point to four different projects: a stretched 26-inch steel cruiser frame, a 700C carbon road frameset built around disc brakes, a 700C carbon gravel frameset with internal routing, and a used steel 29er mountain bike frame. The frames here span a meaningful price range, with the cruiser frame on the lower end and the carbon road frameset on the higher end.
- For a laid-back custom cruiser: Micargi 26-inch stretch frame.
- For a performance road build: BXT 700C carbon road frameset.
- For a mixed-surface gravel build: BXT 700C carbon gravel frameset.
- For a 29-inch steel single-speed project: Niner SIR 9 V1.
Listed price comparison
The table below compares listed prices only.
| Product | Listed price | Price bar |
|---|---|---|
| 26\" Bike Frame DIY Stretch Beach Cruiser Bicycle MBI Puma Stretch Bike Frame | USD 250.99 | |
| 700C Carbon Disc Brake Road Bike Frame 950g Superlight Road Bicycle Frameset | USD 546.77 | |
| Gravel Bike Frame 700C Internal Routing Disc Brake Carbon Gravel Bike Frameset | USD 454.35 | |
| Niner SIR 9 V1 Steel Mtn Bike Frame MED Single Speed 29\" Solid Gold Reynolds 853 | USD 449.95 |
The span from the most accessible to the most expensive option here is USD 295.78. That's a real budget difference, but the more meaningful difference is the kind of build each frame is meant for.
Decision matrix
| Product | Decision driver | Watch-out |
|---|---|---|
| Micargi stretch frame | Long steel cruiser platform for a relaxed custom project | Sold with chainguard only, so the fork and other parts are separate |
| BXT road carbon frameset | Carbon road frame with disc brakes and a light focus | Highest listed price in this set; this version is sky blue and 52cm |
| BXT gravel carbon frameset | Carbon gravel frame with internal routing and disc brakes | Offered in 54cm no-logo black matte for this version |
| Niner SIR 9 V1 | Used steel 29er frame with a single-speed setup | Used condition, so it's a pre-owned steel platform |
Product notes
26\" Bike Frame DIY Stretch Beach Cruiser Bicycle MBI Puma Stretch Bike Frame
Listed at USD 250.99, this Micargi Puma 26-inch stretch cruiser frame is a steel platform for a long, relaxed beach-cruiser build. The frame has a 55-inch total length, a 5-1/2-inch steel head tube, and a 1-inch fork tube inner diameter. It's finished in matte black and is listed as new. The frame is sold with a chainguard only, which means you'll plan the rest of the bike around that stretched stance. If you want a low-key, DIY cruiser project with a lot of visual stretch, this is the lowest-priced frame in this group, but the purchase is specifically the frame with chainguard only, so the fork will need to be selected separately.
700C Carbon Disc Brake Road Bike Frame 950g Superlight Road Bicycle Frameset
At USD 546.77, this BXT road frameset is the priciest frame in this set, and it's aimed at a performance road build. The frameset is built with T700+T800 carbon fibre, with a 950g+/-50g frame weight for the 56cm size; this version is 52cm in sky blue. It's designed around 700C wheels and disc brakes, with a 12x100mm front axle spec. If you're assembling a light, modern road bike and the 52cm size matches you, this frameset gives you the core platform. Just note that the available color and size for this version are sky blue and 52cm.
Gravel Bike Frame 700C Internal Routing Disc Brake Carbon Gravel Bike Frameset
This BXT carbon gravel frameset is listed at USD 454.35, set up for 700C wheels with disc brakes and internal routing. It uses T1000 carbon fibre, a screw-in BSA 68mm bottom bracket, a 31.8mm seat clamp, a 27.2mm seat post, and a 1-1/2 inch headset standard. The gravel frame is offered in 54cm with a no-logo black matte finish. It sits between the road frameset and the mountain bike frame on listed price, making it a middle option if you want one platform for mixed surfaces. The version here is 54cm and no-logo black matte, so that's the build you're working with rather than a range of finishes.
Niner SIR 9 V1 Steel Mtn Bike Frame MED Single Speed 29\" Solid Gold Reynolds 853
At USD 449.95, this Niner SIR 9 V1 is a used medium steel mountain bike frame built around 29-inch wheels. It uses Reynolds 853 tubing, a 27.2mm seatpost, and 10x135mm rear spacing. The solid gold finish and single-speed focus make it an interesting project for a 29er singletrack or commuter build. The medium sizing is listed with a rider height range of 5'8\" to 6'0\", which is helpful if you're in that range. Because it's a used frame, you're buying a pre-owned steel platform rather than a new carbon frameset. That said, its listed price is close to the gravel frameset's, so the deciding point is whether a steel 29er single-speed frame fits your build better than a carbon road or gravel option.
Final recommendation by use case
- For a leisurely custom cruiser: the Micargi 26-inch stretch frame keeps the price down while giving you a distinctive stretched steel silhouette to build around.
- For a light, modern road build: the BXT 700C carbon road frameset is the one to start with if the frame size suits you.
- For pavement, gravel, and commutes: the BXT 700C gravel frameset offers a carbon disc-brake platform with internal routing at a price between the road and mountain bike options.
- For a 29er single-speed project with steel character: the Niner SIR 9 V1 is a used medium frame with Reynolds 853 tubing and solid gold style.
