Questions tagged [frames]

Bicycle frame construction, selection, maintenance, and repair.

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6
votes
2answers
892 views

Rear wheel centered at seatstays but offset at chanstays

Built up a new bike. All components are new and unused. As title suggests, rear wheel sits right in the middle of two seatstays (checked with ruler and vernier caliper) but is off by ~3mm at ...
14
votes
3answers
6k views

What are the advantages of investment casting?

I'm starting to see more and more frames using investment casting for head tubes, drop outs, seat tubes, etc. Such as the new WTP c.r.e.a.m. frame . It looks nice, but I'm suspect on how much more ...
0
votes
1answer
71 views

Carbon Bike Frame Chip At Rear Wheel [duplicate]

I was wondering if this is fixable?
9
votes
3answers
2k views

Need help identifying this Vintage road bike :)

I recently bought this old road bike to fix up, but I havent been able to identify it, as the brand stickers are partly scratched out. Hopefully someone out there may know. Please view the photos, ...
4
votes
2answers
107 views

Help identifying a vintage Colnago frame

Can anyone provide a second (or third etc.) opinion on the type of Colnago frame? It looks to be identical to an early 80’s Super but has oval chain stay tubes, a braze on front derailleur mount and ...
4
votes
3answers
475 views

Frame size: a little too small vs a little too big [duplicate]

The bicycle I want to buy comes in three frame sizes. Each of them has the recommended interval for the rider's height. These intervals do not overlap, and with my height I am right at the boundary ...
6
votes
1answer
616 views

What does the frame material name of "SC7 Scandium" mean?

I just realised that my frame material is SC7 scandium. What does that term mean? Is it aluminium alloyed with other elements?
4
votes
2answers
361 views

Can you identify this "BSB 400" steel frame?

I was given quite a nice old tourer some years ago. I think it was a custom-built frame. The only identification is "BSB 400" in a 1980s typeface: It's Reynolds 531, has cantilever bosses and 130mm ...
0
votes
0answers
88 views

My brother gave me a bike for my son, its a Diamondback. Serial # is F5C94618, C is backwards. Can anyone help me with some more info on this

My brother gave me a Diamondback for my son, I'm guessing it's an 85' but not sure. S# is F5C94618 (the C is backwards). Thanks for the help.
0
votes
1answer
107 views

How can I shorten the frame of a "Duchie shopper" bike?

The cycle is a "Duchie shopper". The bike is to big for my wife. Is it possible to shorten it for her? She is 5 ft (152 cm) tall. The bike has a 27 inch wheels. I want to shorten it by ...
0
votes
0answers
61 views

carbon frame bike ktm revelator 4000 2017 damaged

KTM 2017 revelator 4000 in the bottom of the frame I have noticed this failure/puncture. Would you trust the damage here in the picture?
20
votes
9answers
49k views

How many years an aluminium frame lasts in a touring bike?

How long does an aluminium frame lasts in a touring bike? [Removed extra questions to be clear.] Background So far I preferred aluminium vs. steel for many reasons, but if steel lasts significantly ...
15
votes
5answers
7k views

What is the purpose of a serial number?

It seems like pretty much everywhere I look, serial numbers can't do the things that it seems they should be able to do. They can't help people figure out what bike they have. They can't help at all ...
0
votes
1answer
79 views

Lugged steel frame ID

Can't find any sort of serial number stamped anywhere. I am going to strip it down and rebuild it. the downtube shifter cable clamps have 333 on them. Link to the imgur gallery
2
votes
2answers
135 views

Vertical mark on chainstay?

I bought a used 1990's steel bike the other day and have disassembled it for repainting. However I came across a small patch of missing paint on the drive-side chainstay, which had apparently been ...
34
votes
5answers
7k views

How to choose a bike for a very tall and heavy person?

So I have wanted to ride a bike for a long time, I do strongman training, I am 6'6 (200cm) tall and kinda fluctuate between 440 - 480 pounds (200-220 kg) depending on what training I am on. We are ...
1
vote
0answers
52 views

Building a MTB choosing a frame [closed]

I am thinking about building a mountain bike, a trail hardtail with mabye 130 to 140mm fork up front. Any suggestions on what to look for in getting the right frame?
1
vote
2answers
295 views

Do recumbent bicycles cause knee pain?

I've been thinking about the way the body is positioned on a recumbent bicycle and it seems like knee pain might result. Even if you use a low gearing I think the force direction will always be in a ...
5
votes
1answer
277 views

Buidling my own bike - what are these VERY small rings for in the fork?

I am trying to build my own bike. I ordered a frame that came with a fork and the stem locks. Now I am finished and i unfortunately see two of these VERY small rings.. they came with the fork+frame ...
1
vote
1answer
97 views

Help with identifying this "Cinelli" bike frame

Found this being sold for cheap locally, and I was wondering what type of frame this is, or if it is even a legit cinelli frame: Tried googling it, but I can't find any leads. Thanks for the help! ...
12
votes
7answers
6k views

Is it worth buying a high end light bike (8.5 kg) from 80' vs recent mid range bike (10kg)

I want to acquire my first road bike with a limited budget (~400€) but I'm faced with a lot of choices, found an old vitus 979 equiped with campagnolo chorus, a little rusty but really pretty and ...
3
votes
1answer
89 views

Correct saddle height v correct frame size

This is something that has always intrigued me. I expect there are numerous answers to this here. Apologies in advance! I'm 178cm tall with a 73cm inside leg. I've cycled for more years than I'd like ...
6
votes
2answers
297 views

Questions about Boost frames and cranksets

I made the plunge and have purchased a new 2016 Stumpjumper FSR carbon frame. The post on eBay--from the Specialized Outlet Store, no less--was incorrect when it stated the frame had 142mm rear ...
-1
votes
1answer
63 views

Warranty nukeproof mega elite 290 carbon M

Does anyone have any info on what the warranty would be for all parts on my carbon nukeproof mega have (bought from chain reaction cycles)? Thanks!
4
votes
2answers
663 views

Slightly bent seat stays. Should I worry about it?

I just realized my seat stays are slightly bent The frame is steel. Is this something I should be worried about? PS: notice how also the top of the seat stay is naturally bent. Perhaps a normal design ...
11
votes
4answers
2k views

I have a question regarding the structural integrity of my aluminum frame after its having... incurred damage;

Apologies if this has been covered previously, but I didn't see it if it had been, and at this point I'm at a loss. For context, the bike in question is this year's Haro Double Peak Sport 29 https://...
1
vote
1answer
132 views

How unsafe is it to ride a bike with this dent in aluminium top tube?

This didn't happen as part of a crash. In fact, I'm not sure what might be the reason. I just looked down and saw this while riding on a sunny day. My bike is always in my room and I live alone. I sit ...
5
votes
1answer
830 views

Dent near bottom bracket on vintage steel frame

I just bought myself an old vintage Koga Miyata and just realized today that there's a weird dent on the frame near bottom bracket. Is this something I should be worried about? Or is it normal with ...
0
votes
0answers
84 views

Can I use mtb rigid fork in touring frame?

I am looking to change my fork because of some issue(broken). My problem is my headtube is the standard ec34, which is why I can't use tapered fork. So, I am looking at some mtb rigid fork, which have ...
4
votes
4answers
1k views

How to recognize a cheap from a quality steel frame

I decided to build my own bike. Went to a bike shop, took the first broken bike they had for 40 euro that I kind of liked and fixed it up to a nice (what I think) build (thanks RJ bike guy videos) (...
7
votes
2answers
1k views

Scratch or Crack?

I'm curious on opinions if this is a crack or a scratch. No crashes. No drops. Yes creaking.
0
votes
1answer
65 views

What BMX frame did I find? [closed]

it has HH so I'm assuming Haro the number on the bike is as follows F2W7GO586 if you can tell me what I have and what its possibly worth
3
votes
1answer
173 views

Canyon ULT and Wahoo Kickr

Bought a wahoo Kickr in November and noticed a small chip to my canyon ultimate carbon frame. In January, Canyon announced the Ultimate was not compatible with Kickr. I'm dealing with Canyon and Wahoo,...
2
votes
2answers
155 views

Are worse QC'ed carbon frames chosen for pairing with lower tier components? Does it matter?

I am wondering if in carbon (or any other material, for that matter) manufacturers explicitly choose the better crafted frames to pair with higher tier components. By better crafted I mean of all ...
1
vote
3answers
43 views

What hub for cassette to mount in frame with ear fork width 12cm (currently it's single speed)

I have a single speed bike with rear fork width 12cm. Is it possible to mount there a hub with multi gear freewheel? I measured my other bike's rear fork width and it's wider - 13cm. So I expect that ...
2
votes
3answers
128 views

Carbon fiber aesthetics vs. poor craftsmanship vs. possible repair? [duplicate]

Today a N.O.S. 2016 Stumpjumper FSR carbon frame set arrived, and I'm not impressed with some aspects of the way the carbon fiber front triangle appears. My CF experience is limited having only owned ...
2
votes
5answers
232 views

Would It be fatally dangerous to ride with this dent [Pictures]?

Hello fellow cyclists, I have had a crash recently and there's a minor dent at the top tube. The manufacturer (Canyon) is telling me it'll take them 8 weeks to make an appointment for me to replace ...
0
votes
1answer
59 views

Best way to clean powder coat overspray

I have a BMX frame that has overspray from a powder coating job on one of the v-brake posts, impeding the rotation of the arm back to the original position. Assuming the idea would be to gently sand ...
0
votes
2answers
78 views

What model are these forks?

Recently, I picked up this set of threaded forks. I saw the chrome and it looked clean enough so took a better look and saw the make ‘campagnolo’ written on the stem. In the end I got them for the ...
-1
votes
2answers
71 views

Some bluesheets for bike frame size? [closed]

I need some basic bluesheet that illustrates/show the different size/angles of a bike frame, but googling I can't find nothing else than consumer standpoints like for whom an xl bike is aimed for and ...
10
votes
2answers
1k views

Help please to identify my Tandem

I have just purchased an old tandem, but don't know the make or year. Can anyone help me to identify it. The frame is steel and it has a frame number of 452599. There are no decals fitted but I attach ...
3
votes
2answers
119 views

Should I buy a little bit bigger bike?

I want to buy a mountain bike for the summer to ride with my friends, go on shorter rides (max 6 hours) and use in town. I am approximately 175 cm tall and 16 years old (so I might grow a bit). My ...
2
votes
1answer
62 views

Rattle inside frame: cause for concern?

Recently, something started rattling inside of my less than a year old hardtail mountain bike frame. I was unable to figure out what, and could not fix it. Is this cause for concern? The frame is ...
2
votes
3answers
445 views

What are the times and costs involved in assembling a rideable bicycle from a salvaged frame?

Let's assume I bought a frame for XXX eur/usd/gbp. It usually is a steel frame from late '80s/90s, or an aluminium frame from the early '00s. The frame is of decent quality, it does not present ...
1
vote
1answer
152 views

Is this old steel frame MTB too big based on standover clearance?

Background: I'm a road bike rider but I bought a cheap but well kept old chro-moly steel frame 26er mountain bike (80s or early 90s model Miyata). I am planning on converting this to an ebike with a ...
0
votes
0answers
30 views

I can not identify my bike and these serial numbers can you help.? [duplicate]

I can not identify my bike and these serial numbers are not pulling up anything SNACY 12H11569 can anyone help me find the name of this bike frame ?
2
votes
2answers
140 views

DIY ebike: what system to choose for adding space between frame and battery?

So, the project is to install this 5kg battery: on this bike: This is no joke. I'm serious. Following up to this previous question, I'm going to use steel rivnuts (aluminium is really too light for ...
2
votes
1answer
414 views

Blind rivet nuts for ebike battery on frame: aluminium or steel?

I'm planning my first installation of an ebike battery by drilling/riveting the frame (photo of the battery below), here are some details about the project: The battery weights about 5 kg. It's a ...
9
votes
4answers
19k views

How to match a paint color?

Do you know how to match a color on the frame ? I want to buy a paint from a tool shop but I'm not sure if it's match with the frame color. I'm going to use the paint for a touch up. Thanks for the ...
12
votes
4answers
18k views

Why offset the rear rim to the hub and not the hub in the frame?

I'm currently reading The Bicycle Wheel by Jobst Brandt, and I'm reading all of the issues with offsetting the rear rim toward the drive side of the hub... Asymmetry in a rear wheel built for a ...

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