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13 votes
1 answer
2k views

Why do most road bike sizes use the same wheel size?

I don't understand why virtually all road bike sizes use the same wheel size. To give an example, the Pinarello Dogma F12 comes in 13 different sizes, and, as one may guess, the smallest is ...
Bernardo Sulzbach's user avatar
11 votes
4 answers
4k views

Bike too large, if I change the wheels to a smaller size will this lower the height?

I've got a second hand Raleigh racing bicycle. The frame is too big, when I stand on the bike, off the seat, my toes only just touch the ground. I'm not thinking this is safe to ride around London. I ...
K C's user avatar
  • 111
8 votes
4 answers
3k views

Are 26'' wheels and tubes a thing of the past?

I'm thinking of buy an expensive touring bicycle. One of the bicycles has 26'' wheels. (https://www.patria.net/produkt/terra-legendaeres-reiserad/) The other one has 27.5'' wheels. (https://www.patria....
AhseemHermanson's user avatar
8 votes
3 answers
3k views

Which measurements are most important to consider for tall men?

I am 6'8" and 255lbs so my figure is a bit between Kevin Durant (not as skinny) and Lebron (in shape but not as muscly). For smaller bikes such as what you would find in Wal-mart, I frequently see ...
djsoteric's user avatar
7 votes
3 answers
2k views

I think I chose the wrong road bike size

I went to a local bike shop a couple days ago and picked up a road bike. I think I chose the wrong size. I bought a medium size instead of a small. I’m 5’7 and I feel comfortable during the first two ...
Jimmy's user avatar
  • 91
7 votes
2 answers
642 views

Tire Size Road Bike

I need new tires and not sure what size to order. Here are photos of my bike tires. I see 622x 15, but also see 25mm as a stand alone number. 622-25 seems more likely for my road bike, not sure if ...
user65636's user avatar
6 votes
6 answers
2k views

26 inch or 29 inch wheel for hybrid road bike

I'm 5 foot 1, and I'm stuck between a two bikes one 29 inch wheel and the other 26 inch hybrid bikes (more towards road bike style) for errands around a metropolitan city. Both bikes have a small ...
User1265's user avatar
6 votes
2 answers
4k views

Do I need a chain breaker tool to install a new chain on my bicycle?

Do I need a tool, or will the chain have the correct length? For example, my biggest cog in the rear is 34T and the biggest chainring at the front is 42T and the chain has 116 links. Is a chain with ...
Stelios Liakopoulos's user avatar
6 votes
1 answer
14k views

Can I replace 700×23C tire with 700×28? [duplicate]

I have Trek 1.1 with currently 700*23C tyres. I need to replace them but the one available in market are 700*28 Can I use this size as replacement? If yes, what'll be advantage and disadvantages?
dragosrsupercool's user avatar
6 votes
3 answers
523 views

Replacing pulley wheels on a RD-m3100 with non original parts. Can I use other Shimano pulley wheels?

I need to replace the pulley wheels on my rd-m3100. The T-pulley is close to worn down (ninja-starry), even though the G-pulley still has some life left. Unfortunately the original replacement part, ...
WornChain's user avatar
  • 1,664
6 votes
2 answers
4k views

32-622 tire too small for 622x19 rim?

I recently bought a Mavic A 319 rim with ETRO 622 x 19C and Schwalbe Marathon 28" tire with ETRO 32-622. Based on the tire sizing chart found at Sheldown Brown (https://www.sheldonbrown.com/tire-...
fvclaus's user avatar
  • 305
6 votes
1 answer
195 views

Help me choose a new bicycle size having different geometry

My current bicycle is Triban RC 500 size L (56): https://www.decathlon.co.uk/p/road-bike-triban-rc-500-disc-brake/_/R-p-308097 My hight is 185cm by leg inseam is 90cm. I am looking to buy Bianchi ...
Steve's user avatar
  • 163
5 votes
4 answers
3k views

Can getting a larger sized bike make the bike less aggressive?

Is it practical to get a slightly larger sized bike and thereby make the seat lower relative to the frame in order to make the bike less aggressive? I'm looking at a Specialized Allez road bike and ...
Lightsout's user avatar
  • 1,737
5 votes
3 answers
3k views

Shimano STI shifters: do they come in different sizes?

I was sure that there's only one size for Shimano road bike shifters. But now I'm helping a friend to choose a bicycle and it seems that a lot of them have bigger shifters judging by images that I'm ...
Ivan's user avatar
  • 661
5 votes
2 answers
4k views

50cm road bike for 5'8 height

The road bike I'm planning on buying is only available in 49cm and 50cm. Will that be okay given that my height is 5'8/9?
Anonymous newbee's user avatar
5 votes
1 answer
350 views

Why do the ISO/ETRTO numbers not match the English measure on my Tires?

Given: A flat tire Tire size 47-507, 24 x 1.75 I want to replace both the tire and the tube. But in the shop it's only available 44-507, 24 x 1.75. The tire size of 24 x 1.75 is common to both my ...
Evmorov's user avatar
  • 153
5 votes
2 answers
979 views

I am 182cm with an inseam length of 82cm. Will Specialized Tarmac road bike size 54 fit?

I am about to invest in a used Specialised Tarmac SL4 but I am unsure whether to go for a size 54 or 56. Been riding a size 58 and found it to be too long for me. Was wondering if I could go for a ...
BatS00p's user avatar
  • 51
4 votes
3 answers
2k views

Can a more aggressive geometry/set up be more fatiguing?

For context, I’ve been cycling on a cheap as chips second hand, effectively, “Walmart” type of bike for a couple of years. Not only was it my bike for general usage, I also used it for courier work. I’...
Ms21's user avatar
  • 51
4 votes
3 answers
8k 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 ...
nightrider's user avatar
  • 7,879
4 votes
3 answers
2k views

Size of old road frames compared to new ones

May I use an old frame (pre 1990) of same size as a modern road frame? For example by using a long stem and long seatpost. Or would I have to size up a lot? Concrete example: I ride a 56 cm Merida ...
gschenk's user avatar
  • 9,778
4 votes
1 answer
490 views

Help to find the right tyre for my Scott ebike

I bought a bike just over a year ago and towards December I went into my local Halfords looking to replace my tyres and was told that my wheel size (he checked on the tyre that is currently fitted ...
Andrew Marlow's user avatar
4 votes
1 answer
275 views

Suitability of open sided bearings for frame pivots

On a 10 year old bike I am trying to replace miniature frame pivot bearings which measure 9mm x 17mm x 4mm, pictured below, and are sealed with 689z stamped on. They must measure the same dimensions ...
Swifty's user avatar
  • 12.8k
4 votes
3 answers
4k views

Properly sizing a frameset online (Ritchey Road Logic)?

Longtime lurker, first-time poster. My frame is cracked and I have mostly decent parts so I am thinking about just buying a frameset and paying the LBS to move stuff over. A friend suggested I look ...
Goemon's user avatar
  • 41
4 votes
1 answer
406 views

the standover height on my bike is a but tall. I can touch the ground, but I touch the top tube as well. Any ideas?

My dad recently bought me a new bike. I am 158 cm tall, and the bike is 53 size frame. I can comfortably ride it (without cleat pedals), but when I stop/finish my ride and try to get off the bike it ...
Buse Ozkan's user avatar
3 votes
3 answers
5k views

How to be certain a Boardman ADV 8.8 would fit without prior road bike experience?

I'm looking to buy my first road bike - an adventure/gravel road bike. Question: How can I be certain it's okay or not? And should I be looking for a bike that's closer to my estimated frame ...
user39907's user avatar
3 votes
5 answers
9k views

Is it safe to ride a small bike?

I just bought a bicycle, and according to the seller, for me, with 180 cm, I need an L size. But unfortunately, mine is M. I noticed that only when I'm already having the bike. Can this do me any ...
Lkaf Temravet's user avatar
3 votes
1 answer
2k views

Can I put 28" tires on 27,5" wheel?

My bike has 27,5" wheels and the rear tire is due for replacement. Will a 28" tire stay on a 27,5 MTB wheel once inflated to 30+ PSI? This is not a tubeless tire, it has inner tube. Has ...
Dan's user avatar
  • 33
3 votes
3 answers
3k views

Correct frame size, will 56 and 58cm work?

I'm new to bicycling (I have a 7 speed HEAVY beach cruiser I use for 10-20 mile rides). I am looking into used road bikes now. I checked several places to measure what size frame I should get for a ...
Jackson's user avatar
  • 31
3 votes
2 answers
1k views

Frame size of Cannondale Synapse

I need to sell my husband's Cannondale Synapse. Can anyone tell me how I identify its frame size, please?
Missy's user avatar
  • 31
3 votes
1 answer
639 views

Is this a long or medium cage Shimano XT 10 RD-M786-(S)GS rear derailleur?

Update Thanks for the replies and comments. I finally managed to compare with a new RD-M786 derailleur, and it's a medium size. I think this is a Shimano XT 10 RD-M786 rear derailleur but is it a ...
AhseemHermanson's user avatar
3 votes
2 answers
3k views

How to determine which size spoke wrench I should buy?

I was advised to use a dedicated spoke wrench (not multitool) when possible, so I am looking to order one online. How can I determine which size I need before ordering it? I do have a multitool with ...
Szabolcs's user avatar
  • 996
3 votes
1 answer
139 views

Bolt size for Sora BL-3500 flat bar brake lever

I purchased a pair of Sora BL-3500 brake levers second hand. These were sold without handlebar clamp bolts. I optimistically thought I could re-use the ones from my old mid 1990's Shimano brake ...
Superman.Lopez's user avatar
3 votes
3 answers
145 views

What road bike size to get?

I am very new to road bikes and have decided to buy one. The problem is both shops I have gone to said I should get a 54cm frame, even though I'm only 5'5. This seems to go against a lot of online ...
DevinJC's user avatar
  • 31
3 votes
2 answers
576 views

Which new road bikes can have seat height 890mm or more?

I'm looking for a new aero road bike. I'm a tall person. And from past experiences and from bike-fiting advices I need a seat height of around 890-895mm. I checked Cannondale, BMC, Factor, Orbea. They ...
Can Vural's user avatar
  • 153
3 votes
2 answers
466 views

Do Shimano MTB shoes in half-sizes make a perceptible comfort difference?

My 10+ year old MTB shoes are finally dying. I'm looking for replacements. My shoe size is usually 7 UK (42 EU) for the left foot and 7.5 UK (43) for the right. I see Shimano do European half sizes ...
Bernard Tyers's user avatar
3 votes
1 answer
1k views

Are my cycling shoes too big? With 3/4 inch of room

My shoes came in the mail and I have about 3/4 inch of room to the end. On a short ride I didn’t notice any slipping when I had the boa tightened all the way up. I also don’t have any hotspots or ...
Tristan Troftgruben's user avatar
3 votes
2 answers
723 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 ...
fabike's user avatar
  • 31
3 votes
2 answers
2k views

What are the axle nut sizes on the brompton?

What are the exact specifications of the nuts used on the various axles of the Brompton bicycle? Specifically, I have a 2016 M6R black, but I would appreciate it if you listed the specifications for ...
qzcft's user avatar
  • 101
2 votes
2 answers
1k views

Wheel size: 650 to 700

I have a Trek Speed concept series 7 frame size XS triathlon bike which is fitted with 650 size wheels. However I was wondering if I could at all put 700 wheels/tyres on, as when I brought it 2nd hand ...
Jess's user avatar
  • 21
2 votes
3 answers
13k views

Bike Frame Size for MTB Leisure Rides

I am looking to buy a bike for my wife on the internet, but the challenge is I do not know what frame will be most suitable for her. We plan to buy a hardtail for leisure rides on the weekends so we ...
Alec T's user avatar
  • 185
2 votes
2 answers
2k views

How to determine tire size when the sidewall label is unreadable?

I have a women's Mongoose hybrid bike that is older. The tires are dry rotted and I can't read the tire size info. How do I determine what size replacements to buy?
H. Price's user avatar
2 votes
1 answer
344 views

Do tubed tires fit all rims, or is there anything I should watch out for?

My bicycle is about 25 years old and for the past decade has been sitting out on my balcony (dry, but outside temperature, which around here means from -15°C to +40°C or so). Lately I've been thinking ...
Vilx-'s user avatar
  • 975
2 votes
3 answers
6k views

Can I ride a big bike?

I am a MTB beginner and I just bought a used Giant stance 2. I knew from the beginning the bike is bigger than I should have, but it was a good deal. The bike frame is XL and I am 6’. Based on Giant ...
Kristyna Rehovicova's user avatar
2 votes
2 answers
339 views

700c to 26in V-brake conversion

I have search high and low and feel like I’m kinda close to the solution but.. does anyone know if there is some sort of adapter that facilitates my V-brakes to be lower, offering me the chance to put ...
duhnlic's user avatar
  • 141
2 votes
1 answer
266 views

What tire and air chamber should I buy for 650x35B - 26x1 1/2?

I got an old bike an the tires are all crumbling so I need to change them. I'm new to changing tires but I know I need to look for the model that on the current tires it is "650x35B - 26x1 1/2&...
Dantert's user avatar
  • 23
2 votes
2 answers
2k views

Which size SKS Bluemels will fit my frame - 35, 42, 45?

I'm thinking of getting full mudguards for my road bike, the Triban RC 520 , (details here) , and the manufacturer's page tells me that it comes with 700 x 28 tires and the frame is compatible with ...
An Ant's user avatar
  • 322
2 votes
1 answer
289 views

Is the use of wide fatbike tires problematic with 100mm BSA bottom brackets?

Fatbike frames typically come with 100mm or 120mm BSA BBs. Does the 120mm BB help anything, though? For example, if I have a 100mm bottom bracket and a 5" tire on a 100mm rim, and I switch to the ...
Dmitri Nesteruk's user avatar
2 votes
1 answer
766 views

Replacing bike frame on BMC Alpenchallenge AC01

I have a BMC Alpenchallenge AC01 IGH Alfine 8 Speed 2017 size small. Although the size is appropriate for me, I would prefer the medium, but the small was 47% off, so I bought it. Now I have the ...
Vitor Castro's user avatar
2 votes
1 answer
759 views

Does a hybrid or mountain bike with a 24" diameter rim use a 24" tube and 24" tire?

I tried to search this at length but I have not found an answer. Should a bigger size be gotten or am I over thinking this?
adamaero's user avatar
  • 121
2 votes
1 answer
423 views

Spacing for the front wheel on GT Agressor

I'm thinking about purchasing the NUKEPROOF HORIZON V2 FRONT WHEEL or Spank 359 vibrocore both 27.5. I'm just wondering the best wheelset for my bike and what would fit. I had an accident and my rim ...
Caden Sorensen's user avatar