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Questions tagged [frames]

Bicycle frame construction, selection, maintenance, and repair.

0
votes
1answer
16 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 ...
1
vote
1answer
190 views

Posture on mountain bike long term

I have been looking at sizing guides because I'm contemplating ordering a new bike and found out that I'm the totally wrong size for the bike I actually have. I'm normal proportions and 5 foot 7, but ...
2
votes
4answers
7k views

What is the weight difference between frame sizes?

I was wondering if any one has an idea of how much more weight a larger size bike weighs. Specifically S-works Tarmac. So for example what would the difference in weight be between a 56 compared to a ...
4
votes
1answer
272 views

does anybody recognize this mtb frame?

I just got this frame for a few bucks and I wonder if it is from a known manufacturer or not. I often find bikes with similar design aspects, but not this frame. There was also a Marzocchi 55 ETA from ...
4
votes
4answers
1k views

I have a hybrid bike which the frame is too big, is there any modifications I can make to make it more comfortable?

I bought a hybrid bike from halfords around 6 months ago, however i have only recently had chance to ride it. I have found that the frame is too big, they wont exchange or give me a refund. I was ...
2
votes
1answer
154 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 ...
3
votes
2answers
102 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
86 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 ...
2
votes
1answer
3k views

Can I change a 26“ to a 24” tire on a Huntington Schinn Women's tire?

I recently purchase a Huntington Cruiser by Schwinn. The standard tires are 26". I am new to cycling and am having a hard time finding information regarding tires and frames. I would like to change ...
2
votes
3answers
5k views

Can a (relative) beginner adjust spacing on a 501 cromo road frame?

Have acquired a cheap old Peugeot road bike from ebay; nice cromo frame, but it needs a new rear wheel and unfortunately I didn't check the dropout size before buying. It has an OLD of ~120mm, but I ...
-3
votes
1answer
75 views
18
votes
8answers
16k views

Rear wheel slipping out under load

My commuting/cyclocross bike (a Surly Crosscheck) has a problem. If I tighten the quick release skewer to a normal level, sort of firm to close it, then if I step on the pedals hard at some point, ...
4
votes
3answers
1k views

Is it safe to use aluminium seatpost adapter (27.2mm to 31.6mm) for a carbon frame?

I have Cane Creek Thudbuster Seastpost (aluminium) 27.2mm x 400mm which i want to use for a bike with a carbon frame (31.6mm seat-tube). I'm thinking about getting a seatpost adapter/shim from 27.2mm ...
25
votes
6answers
19k views

What is the difference between a horizontal top tube and a sloped one?

Some comparable bicycles have a crossbar (top tube) that's horizontal: Others have one that's sloped: What are the reasons for either frame design? Is it merely style preferences? Or is there more ...
1
vote
0answers
51 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
123 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 ...
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 ...
1
vote
1answer
117 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 ...
4
votes
1answer
4k views

Is it possible to run standard mechanical shifting on a Scott Foil Premium frame?

The Scott Foil Premium is the highest end frame available from Scott Sports, and it is designed to run an electronic drive train, routed internally. The original reports were that this frame would be ...
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
86 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
105 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 ...
4
votes
0answers
486 views

Help identifying MTB frame

Apologies making ANOTHER one of these threads...Anyhows: Bought a bike third hand, frame has been stripped and painted. Trying to find make & model so I can get some offset bushings for the shock. ...
3
votes
3answers
3k views

Difference between “Track Frame set” and a “TimeTrial/Triathalon frame set”

I am going to make a custom fixie bike (possibly with a front brake) that I will use to race on tracks and even commute with. I have been looking at a Planet X frame, and they seem to have very ...
4
votes
5answers
356 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 ...
3
votes
2answers
2k views

Why does a bike frame have to be above 56 cm usually to fit 700c tires?

I first came across this when I was looking at the Surly LHT, but I started to see it everywhere. It seems to me they can just put on a longer fork or something, or is it more for the back wheel?
3
votes
2answers
147 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
109 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 ...
3
votes
1answer
123 views
-5
votes
1answer
67 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
106 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
72 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
1answer
114 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
0answers
172 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!
5
votes
3answers
907 views

What's this part of the bike, and is it safe to alter it?

The video shows someone installing a gps bike tracker, however there is not much room in the top of the head tube, so he hammers down what's already in there in order to make room for the tracker. In ...
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 ...
22
votes
18answers
3k views

What different frame materials have been used?

In response to yet another frame materials question, I thought it might be useful to start with a more answerable question. One answer per material please, with an example of a bicycle frame using ...
-4
votes
2answers
555 views

Identify: 26in dirt jumper/bmx bike “fetish” brand?

I bought a 26in dirt jumper/bmx bike. No markings but the guy said it was a fetish. The set up is bmx but the frame looks like a jumper. Bmx cranks and dropouts. The serial number is SNFSD13BF1725.
8
votes
7answers
4k views

Is it worth buying carbon fiber road bike for short commutes?

I'm planning to use a bike for rather short commutes (max half an hour), will the carbon fiber be noticeably more comfortable than aluminium one?
1
vote
3answers
187 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 ...
3
votes
1answer
122 views

How to evaluate different alloy types used for bicycle frames?

Only certain alloys are used for bicycle frames besides other materials like carbon fibres (at least for the mass market). I often stumble over aluminium alloy 6061 and 7005 (and I think I saw 8004 ...
12
votes
2answers
8k views

Name that frame! (Likely Japanese, likely made in 1986, with known serial number, likely a Bianchi)

(This post was substanically edited/updated on 5/8/14.) I have a bike frame of unknown lineage. What is known: The serial number under the bottom bracket is IS513786. This fits with the serial ...
19
votes
2answers
1k views

How to prepare a frame for a new paintjob

I want to have my bike frame repainted. What should I do before I give it to the paint shop? How would they like to have it prepared?
9
votes
3answers
4k views

Is my derailleur hanger too bent?

I bent the (steel) derailleur hanger on my 9spd cassetted (steel) Bianchi Volpe about 1.5 yrs ago, and I just did it again, but worse. This time the derailleur got sucked into the wheel and really did ...
2
votes
2answers
500 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
151 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?
3
votes
3answers
105 views

Regaining frame aligment

I bought a belt driven bike which had had the rear triangle of the frame moderately bent (i.e. bent but no tubes collapsed or cracked) – it was a gamble as to whether it’s fixable…. It has a Nuvinci ...
-1
votes
1answer
61 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.
1
vote
0answers
195 views

BMX frame logo identification

I have a BMX frame with a stylised "h" on the rear forks. Can anyone ID it for me?
3
votes
2answers
231 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.