Bicycles

Questions tagged [frames]

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Bicycle frame construction, selection, maintenance, and repair.

580 questions
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3
votes
1answer
130 views

How to / is it possible to straighten a bent seatstay/chainstay on a steel frame? At home or inexpensively by a professional

I have a Genesis Croix de Fer 20 (725 Chromoly) and crashed with my friend on his bike. On one side the back of the frame bent out so the wheel drops out, it is bent but not crumpled. I would like ...
4
votes
2answers
131 views

How important is it to re-space my rear hub?

I just bought new wheels for an older Schwinn frame. I don't know the date it was made, but it's a steel frame and as built it had stem shifters and a cup-and-cone bottom bracket, etc. Probably from ...
3
votes
1answer
121 views

Identify this BMX logo please?

Hi all, having trouble identifying this logo found on my Bmx frame- any ideas? Many thanks More info: It was bought with all high end parts- and was said to be WTP Justice or other WTP frame—...
1
vote
3answers
168 views

Can this frame be used or is it done?

I have a cheap mens Huffy mountain bike which I noticed has 2 holes in the frame. Would this be too unsafe to ride?
1
vote
1answer
145 views

Is this damaged aluminium frame unsafe to use?

Hello I have a Giant Seek 3 aluminium frame where somehow the rear rim has rubbed the frame creating a hole as shown in the picture. On the other side there has also been some rubbing/scratching but ...
-2
votes
2answers
107 views

Can you tell me what this frame is and year please

I need to identify a bmx frame i have Its a twin top rail
2
votes
2answers
361 views

Bent Peugeot Carbolite 103 Frame

I have a vintage Peugeot carbolite 103 frame which is really bent. The rear triangle is bent in the direction of the drive side to such an extent that the drive side crank arm is blocked by the frame ...
2
votes
0answers
95 views

Can anyone give me some information on this Peugeot frame I bought this weekend?

I've been looking through old Peugeot brochures and searched the numbers on the frame but I cant find any pictures of any Peugeot bikes that look like this one. The chrome section with the flags of ...
10
votes
5answers
3k views

Frame failure sudden death?

I had a serious accident, my fork suddenly snapped when riding. I sent my bike for repair (to get a new fork installed) and the guys at the shop hammered the frame in place, as apparently the frame ...
0
votes
1answer
201 views

Why would a frame lack serial numbers?

Other than being a custom frame or it was stolen is there a explanation for the frame to be missing the serial numbers? For instance do they use the same identification marks over seas?
3
votes
1answer
127 views

Help identifying make of steel elevated chain stay mountain bike frame

Could anyone tell me what is the make or model of this bike there are no visible numbers or name except for this sticker of the maker of the seat tube. I appreciate all the help. you guys know your ...
2
votes
2answers
94 views

Help please - Dent in top tube of double butted aluminium frame

I have a ridgeback velocity which is labled as double butted aluminium. Around the middle of the toptube is a dent shown in the photo. There is also a short line above it which I can feel with my nail....
-4
votes
0answers
58 views

I have a frame and bottom bracket serial # starts with SG15 can anone tell me what brand bike this is [duplicate]

Trying to find out what kind of bike I have, the serial number starts with SG15
6
votes
1answer
62 views

Prevent internally-routed cable housing from vibrating against frame

The rear brake cable and housing are internally routed through the top bar of the frame. It rattles around when riding on bumpy roads and sounds annoying. What's the best way to mitigate this?
0
votes
1answer
73 views

Frame identification

Any idea of the maker of this carbon frame, if more photos needed just let me know
0
votes
3answers
459 views

Frame adjustment for engine

I want to turn my bike into a motorized one, but i can't get engine clearance because the 2 tubes in the picture are so wide on my bike. I was wondering if I cut those tubes and replace them with ...
3
votes
1answer
225 views

What bicycle manufacturer used this emblem

The top bar has the model name "AMERICANO" but I don't know the name of the frame manufacturer. I would appreciate your help identifying it. Thank you
5
votes
2answers
131 views

Cracks in paint on aluminum frame

I noticed some small cracks in the paint on my aluminum frame bike. The cracks are clustered around the rear brake boss, and only on one side (NDS). The bike is from 2011 and has been ridden over 10,...
4
votes
1answer
170 views

“bent” by design frame

Lately I have been looking on new bikes, and I have seen some design on an aluminum frame which left me quite dubious: That bend seems to scream "I am gonna buckle at the first hard hit!". Are my ...
0
votes
2answers
96 views

What is the best way to raise handle bars

I have bought a second hand 19 inch frame and I am normally used to a 20.5 inch. The bike rides OK but I would benefit from raising the handlebars. I have read about fork steerer tube extenders and ...
-1
votes
1answer
108 views

Hi, I'm looking for some help in identifying this bike frame?

I'm looking for some information on this bike, it's a steel frame road bike with chrome dropouts the rear ones are SR suntour ones, theres no badges or decals on it it was like that when I bought it , ...
-1
votes
1answer
168 views

I'd like to know what kind of bmx bike I have

I got this frame in an old pile of junk ,can you please let me know what kind it it t/y
4
votes
3answers
255 views

How to assess safety of carbon frame after crash?

I was recently hit by a car which pulled onto a roundabout. The driver hadn't seen me. The car hit me hard enough to actually snap the rim of my rear wheel. The bike has a carbon fibre frame and ...
1
vote
1answer
53 views

What kind of fork end is this?

I am looking for a new city/urban bike and thought that a gear hub would be a nice addition (before this I was exclusively using derailleur gears). To get started I was reading the wiki page on fork ...
3
votes
2answers
130 views

Identify this bike please

What kind of bike is this? Looks like it says Tornado. I love the handles - what kind are they?
3
votes
3answers
122 views

Rust hole on tube between chain stays

I've inherited a frame my father used to ride and was planning on getting it blasted and coated. Checking it over it all seems to be in fair condition (its decent 531 Reynold tube), some rust, but ...
-3
votes
1answer
221 views

What kind of bike do I have? Serial number is VF-8S3-20.5-9 [duplicate]

BMX frame has two holes on front tube for forks.
2
votes
1answer
189 views

Rear wheel touch frame during off saddle sprint

bike: Cervelo S2 Photo wheels: Mavic Cosmic Pro Carbon (wheel is true) tyres: Continental Grand Prix 4000S II 23mm Problem is that during off saddle sprint my rear tyre touch the frame and makes ...
1
vote
0answers
87 views

Replace Viner Settanta seat post securing wedge

My seat post wedge has been removed. There seems to be loads of different styles and shapes depending on the make and model of frame. Does anybody know if any other makes will fit it as having trouble ...
-2
votes
2answers
133 views

Are my frame and fork straight?

I have been riding bikes and motorcycles since I can remember. Doing no hands is no problem, my question is with this particular generic bike frame that I built: I cannot do no-hands riding. Is the ...
1
vote
1answer
140 views

Frame with dent

I recently bought a bike and then realized it had a dent on the top tube. I would like to know your opinion if it is safe to ride. The bike is a Devinci Cameleon made from double butted aluminium. The ...
14
votes
3answers
7k views

Can I glue this crack as a temporary solution?

I suddenly noticed a crack in my frame. Is it practical for me to use glue to seal it off as a temporary solution? Edit: Further information ...two incidents so far. Someone opened their driver ...
10
votes
4answers
3k views

Banged frame: Is it still safe to use?

My girlfriend's bicycle was vandalized by a neighbour. It seems like they banged it with a hammer or something right in the middle of the frame. Is this still safe to use?
0
votes
0answers
295 views

Where to get replacement bike frame cable entry grommets?

Does anybody know where to get more of these ? These hold shift and/or brake cable ferrules where the cables enter the frame. Here is what they look on a bike if that helps: These specifically are ...
2
votes
0answers
119 views

Please help me identify this bike frame?

Please help me identify this bike frame for I am a newbie/novice. I will greatly apppreciate it. It appears similar to some 1950s Huffmans, but I am far from certain. Thanks to all in advance who ...
3
votes
2answers
178 views

Headtube dent, how safe is it?

See picture below, I am in this situation with a new alluminium frame (don't ask me how I ended up here, it's a heartbreaking story.) It’s a Cinelli Mash Parallax. The headtube has a dent and I don't ...
0
votes
2answers
114 views

How to judge grade of carbon frame?

Last weekend, a friend told me about a local bicycle shop(Metro Cycles) selling a Carbon Cycle of Hamilton brand. This brand is sort of known in India but only for cheap bicycles. Later I figured out ...
-5
votes
1answer
71 views

IS THIS BIKE SAFE [closed]

https://lh3.googleusercontent.com/S1PKL2uMXwJc2aGjGEybc8ZM4CFk-i5EHWrkZxLSVaD29xUrfIig1ap1dp6Na-WsjMc-Tw=s85 I M LOOKING TO BUY THIS BIKE AND I WOUD LIKE TO KNOW IF IT IS SAFE TO RIDE
1
vote
0answers
111 views

Identifying a brazed steel frame

I'm trying to identify this brazed steel frame I came across. Any help would be greatly appreciated.
0
votes
2answers
76 views

Correct Frame Size Trekking Short Legs

There seem to be two heuristics for determining frame size without testing a bike: inner leg length and body height. I have an inner leg length of 85cm and a body height of 192. According to my inner ...
3
votes
0answers
194 views

Please Help me identify my Bike Logo

Hello can someone help me identify my bike Frame?. It has this weird Logo and a Serial number of : "2948" . It has Suntour Dropouts likely NJS. Thanks!
23
votes
4answers
3k views

Can road bumps excite frame eigen frequencies?

During my last bike holiday I have happened to ride downwhill on roads which had transversal stripes to mark the approaching of a turn. The stripes were made with road paint, and were slightly higher ...
4
votes
5answers
413 views

Is there any reason for the rear frame and bottom bracket to be asymmetric?

I just received a new non-brand carbon frame and immediately noticed that the bottom bracket looks to stick out significantly more to one side than the other, and the rear bottom forks also seem to be ...
1
vote
3answers
424 views

Riding wrong size frame

I’m riding Trek Domane 4.3 2015. According to my height (165 cms) I should be riding 52 frame size(according to Trek size chart). The current bike my riding is 54. The only modification I have done is ...
2
votes
2answers
513 views

Time trial carbon frame scratches. Should I concern?

While cleaning my time trial bike I've noticed many scratches in the frame. See pictures below. My tire pressure is usually around 100 psi, depending on the weather conditions or circuit. My wheels ...
1
vote
1answer
273 views

Paint scratch or carbon crack?

I might just be overly paranoid, but does the line in the image (to the left of the glare) look like a paint scratch or could it be a sign of a spreading crack?
-1
votes
1answer
65 views

What frame is 20" bike

It's the frame from a box bike stamped where the rear wheel goes on I don't know the logo.
3
votes
1answer
126 views

Identify bike brand to fit gear hanger!

I have bought a new used bike, I got it very cheap since it was pretty broken up. I have replaced most of the parts and repainted the bike so it looks fine. The only thing I have a problem with is the ...
3
votes
2answers
242 views

Is it safe to ride this frame?

I don't have a clue what happened… Got the frame this way. Mountain bike is Lapierre Zesty 2014.
6
votes
2answers
204 views

Where did I go wrong with this frame painting procedure?

I just painted a bike frame (steel) with the steps outline below. However, every glancing contact with a rough surface immediately strips paint from the frame and I can see the metal shining through. ...

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