Bicycle frame construction, selection, maintenance, and repair.

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3
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1answer
138 views

Understanding the bike geometry through riding [closed]

Though this question has been asked a lot of times, and there are very good answers out there, all the answers talk about the effect of individual parameters in isolation. That is, they take trail, ...
7
votes
4answers
616 views

To Cold Set or Not To Cold Set?

I have a Trek 620 (Reynolds 531 lugged steel frame) from the mid-80s the rear dropouts are spaced at 126 mm. I'd like to be able to run an 8- or 9-speed cassette and I was wondering about the issues ...
0
votes
1answer
42 views

How to exchange a seat stray on a 2013 Cube AMS 150 Super HPC Race carbon bike?

The derailleur was torn apart so I ordered new seat stays and have to exchange (one of them). I'm not sure how to do it, there are some bearings fastened by screws where hex-wrenches seem to fit on ...
6
votes
4answers
153 views

Fracture in folding frame - safe to ride?

I cycle every day because I live in a city and I find it a fun, fit and convenient mode of transport. I am not a cycling hobbyist, am only averagely fit and know pretty much nothing about bike ...
5
votes
1answer
127 views

How is a frame designed for an easy step-thru?

My question is very specific towards bikes which have a curved top-tube. How is it decided that a particular height of the top tube above the ground for a set of people in a certain height range is ...
3
votes
1answer
146 views

New trend of seat stay for road bike?

I have seen quiet a few road bike with a Z-shape seat stay until now, e.g. specialized Roubaix Does it serve any purpose? What's the advantage of this design in comparison to a straight-bar seat ...
12
votes
5answers
4k views

Can the top tube on a mens bike be cut off?

I want to cut the crossbar on a mens bike to make it easier to get on and off. Will it damage the bike?
4
votes
1answer
152 views

What caused this seat clamp / frame failure?

Here's my "long distance" ride, which is an old steel MTB without suspension. I picked it up by the saddle to move it and felt some play, I thought the saddle rails might have been loose, but as per ...
0
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2answers
222 views

Lemond Frame - what model/year?

I bought this Lemond frame online. I have an opportunity to get some components for it before I actually receive the frame. Hoping to get more info on the bike (model/year) in the hope of getting some ...
1
vote
1answer
213 views

How much is a mass production aluminium frame worth? [closed]

There are several entry level bikes under $600. I actually own one, an excellent Felt F95. I was just curious, how much is a frame of such a bicycle worth? In total, what is the cost of a frame in a ...
0
votes
2answers
889 views

I am 182 cm tall. Is a road bike with a frame height 54cm good for me? [duplicate]

I have an option to buy a road bike that has the height of the frame 54 cm : ...
1
vote
1answer
252 views

Is it possible to buy a frameset from Trek that isn't listed separately?

I am thinking of buying a Trek CrossRip or 720 touring bike, but I want it with Ultegra Di2 and the bikes are only listed on the Trek website with lower-end components. So I'd like to buy a frameset ...
6
votes
1answer
423 views

3D printing frames?

Are there any technical limitations that make 3D printing frames impractical? And, if it is just a matter of time before our technology is able to overcome any limitations (like manufacturing ...
4
votes
4answers
395 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
78 views

How do i figure out the maker of my bike?

There are no words on it, it is a chrome frame and the only markings i found on it were a serial number that reads G1109025563. Is there any way i can get any information on it?
1
vote
1answer
125 views

What steps to take to replace bike frame

I've always known my bike frame was too big for me. I got a great deal on the whole bike when I bought it seven years ago. It was an S-Works, probably from the '90s, with all Ultegra gear in great ...
0
votes
1answer
62 views

Spraying frame of GT Transeo

I've got a GT Transeo 1.0 bike (bought in 2011 or 2010 as best as I can remember) and I'd like to try painting the frame to get rid of some (very minor) surface rust and paint damage. I've read a ...
1
vote
0answers
145 views

anyone know what kind of frame this is? [closed]

Can anyone identify this bike frame? I'm thinking it was stolen, painted, and is being sold on a website, so I was hoping to do a search on a stolen bike database. The original color looks to be ...
5
votes
5answers
364 views

How to estimate price of an old CrMo frame?

So it happened. My old good CrMo friend got hit by a car and the blow was heavy enough to affect the whole frame. Now the car driver is expected to pay back the expenses but I am not sure how to ...
0
votes
1answer
116 views

Tapered suspension fork on a 2003 Surly Karate Monkey frame

Is there any way I can run a modern tapered 1 1/2" to 1 1/8" tapered suspension fork on a 2003 Surly Karate Monkey (Original frame style with V-brake and Disc Brake Mounts). I think it only works with ...
0
votes
4answers
233 views

MInor (I think) dent in top of Orbea Alma top tube - frame ok or no?

UPDATE: My lbs mech / owner (same guy) looked at it this AM, says it is good to go, 'ride the hell out of it', he 100% backs it up. And FWIW re: the specifics of this frame and why it's purely ...
2
votes
1answer
277 views

Can a bike frame be retrofitted with internal cable routing without Disassembly?

Would I be able to have a local framebuilder retrofit an existing steel mountain bike frame to install internally routed cable guides on the top tube without disassembling the frame? I would probably ...
1
vote
3answers
83 views

Safe to shorten a dual-pivot caliper mounting nut?

I have a 2006 Specialized Langster. Unfortunately the brake bridge is not deep enough to insert the shortest caliper mounting nut I could find (10mm). The head of the nut should insert all of the way ...
3
votes
1answer
327 views

What is the cost saving from manufacturing bikes in China vs USA or Taiwan?

I went to a bike shop recently and was surprised to see big "Made in China" stamps on the Trek mountain bikes. I did some research and apparently all the big bike makers manufacture in China now. I ...
1
vote
1answer
394 views

How to repair a broken steel frame, at the rear drop out /chainstay location

I have a Raleigh technium , recently broke at the rear dropout. Angelo had a post w a picture of a broken rear dropout and commented, that this failure on a steel frame was totally repairable, ...
1
vote
1answer
63 views

Have some new parts on hand but need new frame - frame swap reasonable? or sell and purchase new bike?

Purchased my first "decent" bike, a Motobecane 700HT about 5-6 years ago as a 'gateway drug' of sorts for myself to get into XC biking. Ended up using it for commuting for a few years as well. Over ...
1
vote
2answers
103 views

Fort Frame head tube cracked

I have raced my Fort Bike for some time now. The head tube holding the forks has split /cracked open. What do I do now, who do I contact ? Dennis
3
votes
1answer
249 views

Bicycle Frame: anodized Aluminium?

I need help with identify what materials is this frame I need to know if this is indeed aluminium? (weight 1.2 kg for 15 inch frame hybrid, is not ferromagnetic). If it is, why would it have a ...
1
vote
4answers
1k views

Disadvantages of Riding Larger Frame Sized Bike than Reccomended Frame Sized Bike

I unconsciously bought a bike which's frame size is larger than recommended. (My height is 163cm bikes frame size is for people 174-190cm) (I dont have any problems with reaching ground with my feet ...
4
votes
3answers
2k views

Convert old road bike to comfortable commuter

I have an rather old road bike, that I'd like to convert to a comfortable commuting bike. The bike should be used for everyday commuting (< 5km) and occasionally day tours. I'd like to keep the old ...
3
votes
1answer
350 views

What are these holes in my frame for?

I have two threaded holes on the inside of my frame on my 2007 Stumpjumper FSR and I don't know what they are for. Can anyone tell me why they're there?
3
votes
2answers
264 views

How to identify lead paint?

I'm starting renovation work on an old bicycle. One of the things I want to do is a new paint job. I guess before that I'll need to sand the current paint off the frame. So I bought sandpaper. On the ...
0
votes
1answer
149 views

determining make model and year of a BMX frame

is there a specific website where I can simply enter the bicycle serial number to determine the make model and year primarily BMX frames
2
votes
2answers
425 views

Can I change my bike's frame?

A failed stealing attempt left my Bianchi Via Nirone 7 road bike with an ugly damage to the frame. The bike is still in place, and it hurts me every time I go to the bike shed. They removed the front ...
2
votes
0answers
164 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. ...
2
votes
1answer
353 views

Rear disc calliper won't fit, disc mount bent?

I am upgrading my MTB to disc brakes. I have disc compatible wheels and a set of Shimano M446 Postmount callipers and 160mm rotors. Front fork is a Manitou who decided to jump on the Postmount wagon ...
0
votes
2answers
289 views

Rear derailleur hitting chainstay (video in the post)

I filmed a little video of the process: https://youtu.be/ejJsIWrrFTU Does anyone know how to solve the problem? Apart from attaching piece of rubber to the chainstay? It is really annoying, because ...
3
votes
1answer
220 views

Vandalized top tube

My bike was vandalized and the top tube is completely bust, is it possible to get this repaired/replaced? any advice here would be great, thanks a lot.
2
votes
1answer
64 views

Columba folder w/mountain 10sp cassette & Sram X7 derailleur

On my bike the derailleur mounting bracket (hanger) is held by the hub axle and therefore fills some of the dropout slot on one side and pushes the axle lower in the slot on that side. So the axle is ...
0
votes
0answers
78 views

Bike Frame Brand and Model?

enter image description hereI purchased this bike at a thrift shop and it rides like a dream. Out of curiosity I'm trying to figure out the make and brand. The parts on it seem to be very nice so ...
1
vote
3answers
231 views

First Road Bike - Some Options and Issues

I am looking the market for my first road bike. I am planing to be using the bike, couple times per week for 1 - 2 hour rides, and maybe on the weekend some longer ones, around UK Yorkshire. There ...
0
votes
2answers
135 views

What accommodations might be made for riding a frame 4'' too large?

I have been offered possession of a very old and interesting bicycle, made in 1933. It appears to be in quite good condition, and has a lot of interesting history. However, it features a 26'' frame, ...
3
votes
3answers
648 views

Best kind of bicycle for lower back issues?

I've ridden bikes all my life. Now nearing 50, for the past year or two I've noticed that when I ride over 20km or so, my lower back gets extremely painful - enough to make it not possible to ride. ...
0
votes
1answer
643 views

Shimano Hollowtech II bottom bracket: milling the frame necessary?

In a bike shop I recently asked for bottom brackets. The seller said, when choosing a Hollowtech II bottom bracket (like SM-BB70), compared to Octalink/square taper bottom brackets the outer (lateral) ...
0
votes
2answers
476 views

How do I tell the difference between bike brands

I have a 20 inch BMX bike. It was given to me with no stickers or identifying marks on it. How do I tell the difference between brands?
2
votes
4answers
3k views

How to repaint a Carbon bike frame?

I have recently purchased a Specialized Roubaix SL4 Elite Disc carbon frame bicycle - But I am not particularly happy with the colour. It is charcoal and white. I like to have a brighter colour. Is ...
-1
votes
1answer
157 views

Frame not faced for BB. Strip the paint or leave as-is? [duplicate]

So I just got my new frame from the LBS. They were supposed to face the frame, but only faced the head tube (hopefully, can't check it since the headset is already installed.). Sadly, they didn't ...
0
votes
2answers
233 views

unknown make model and year

enter image description here! Can someone please help me identify this frame? I have tried searching the net for same lugs design but I can not find anything that is similar to the lugs of this ...
0
votes
2answers
1k views

Do I need to chase a thread before installing a bottom bracket on a new frame?

Currently I'm building a new Surly Cross Check, and it needs a 68mm BB (english threaded). Furthermore, I plan to use a cheap $15 shimano BB with JIS square tapered interface, nothing special. Do I ...
0
votes
1answer
184 views

Trying to figure out the Brand/Make of this bicycle?

Got this from a friend hand-me-down style. Got some work to do on it to make her roadworthy. But it's been painted, and I can't see a logo or name on it anywhere. Steel Metal Frame. That's about all ...