Ask a Bicycle Question - Part 5

[Tofuuuuuuck]

The folding design is much more better for tern. I terms of ride, both feels almost the same. Go for a test ride to feels it.

I see, i've tried the B7 but yet to try the V8. Will try next week. Understand that you used to have both B7 and V8.

Depends how often you need to use the folding feature. The Vert is not so convenient due to the lack of magnets to secure the bike (you have to use Velcro strap instead).

Didnt know that, i think on top of that, another consideration is that MBS provides 5 years warranty and the other one only provide 1 year.

 

[IronMac]

I just fell down and have a bad cut. Somebody put small offerings and burnt hell money right in the middle of the PCN at Tanjong Rhu/Mountbatten.

Great welcome to the 7th month.

Still trying to stop the bleeding for the past one hour.

Get off the computer and go rest! Speedy recovery!

 

[Sadisticnoob]

Just did some simple Maths to compare the gearing between my 6 speed 16" Brompton and my 20 speed 22" Tern.

I am still perplexed over energy required for different gear ratio for different wheel sized bicycles.


And the questions I have are:

1) I find it very tough to maintain cadence on my Brompton at gear ratio 4.9... the energy required to maintain cadence at this gearing is even higher compared to the highest gear on my Tern. Is there a direct correlation between energy required vs gear ratio?

2) At the same gear inch, all things equal (Tern gear ratio 3.1 vs Brompton gear ratio 4.2), given different wheel sizes, is the energy required to maintain cadence the same?

I always find it much tougher to cycle on Brompton than on my Tern.

Things to note

The lowest gear inches on my brompton is smaller than the smallest gear inches on my Tern. Conversely, the highest gear ratio on my Brompton is also higher than the highest gear inches on my Tern! The gear spread on my Brompton is quite staggering... I have never used gear ratio 6.5 because I don't think its humanly possible to peddle.

hmm for me it seems to be all the same.

Mini velo 53 paired to 12-25 8 speeds

I dont use the last 4 cogs gear ratio (6.2- 4.4) always on the first two.

Time trial bike 650c 53/39 paired to 12-25 10 speeds

usually around the middle to lower (6.9-5.7)

Road bike 53/39 paired to 11-28 11 speeds

usually around 15T or 17t (6.9-6.1)


I do have Cadence and HRM to measure my cadence, my cadence is around 90 average though . my mini velo and time trial bike are hard to ride due to the wheel not being true. mini velo seems to be the slowest for the effort.

You Will Never Ride Alone (During the 7th Month)

Actually, make that “You Shouldn’t Ride Alone (During the 7th Month)". If you’re not Chinese, you’re probably unaware that the most important social event in the Chinese Calendar is coming up: ie. the Hungry Ghost Festival, also called the 7th Month.

Why should you care? After all, in the rest of the world, also called the American Empire, there’s Halloween – a mock-serious day for kids to celebrate the occult and the scary.


This is why every year at about this time, I seek out group rides the way your MP only turns up when it’s time to canvass your vote. Here’s what I learnt about joining a group ride, how to get into one, and proper group riding etiquette to follow.

Why join a riding group?

Safety in numbers is the first reason, although if you are a bad roadie, that might not actually apply.

The second reason to ride in a group is the help everyone can lend to each other when any member has a technical or accident. This includes X-times the number of spares for things like tubes, allen keys or even isotonic fluids.

Third, riders in a group can spur each other to have more fun, ride further and ride harder. If you’re all by your lonesome pedaling-damnit, you’ll be much more tempted to end a ride when you’re fatigued. Compare that to carrying on just to impress that hawt group ride member of the opposite sex (or same sex, if you like that).

You’ll reap the benefits with more fitness, more motivation to ride, and more satisfaction from each ride. Humans are social animals after all, and being in a group ride will lift your spirits and make you feel much more connected to your fellow living humans – especially pertinent if your group is joined midways by something that isn't human, so to speak.

aiya got different group of riding style one , most dont have "mechanic" or "sweeper" or "water boy" but it is more fun and faster because can take turns to block the wind

 

[nwh_sg]

I just fell down and have a bad cut. Somebody put small offerings and burnt hell money right in the middle of the PCN at Tanjong Rhu/Mountbatten.

Great welcome to the 7th month.

Still trying to stop the bleeding for the past one hour.

oh man. wish you a quick recovery.

 

[Sadisticnoob]

next MO opening up!

decided that it will be from bike24, I will order it from next month or so (around September.) shipping costs will be split according to the value of items purchased.


closure once it hits 380 sgd or so (with shipping included)

 

[fatfleaz]

Didnt know that, i think on top of that, another consideration is that MBS provides 5 years warranty and the other one only provide 1 year.

It depends what the warranty covers

 

[beast]

Just did some simple Maths to compare the gearing between my 6 speed 16" Brompton and my 20 speed 22" Tern.

I am still perplexed over energy required for different gear ratio for different wheel sized bicycles.

This is my 20 speed 22" Tern. Favourite cruising gear ratios are 3.8, 4.1 and 4.4.

This is the gearing for my 6 speed 16" Brompton. ,My favourite sweet spot for cruising is 4.2. Sometimes when conditions are favourite are favourable (no head on wind, high cadence), I can switch to 4.9...

And the questions I have are:

1) I find it very tough to maintain cadence on my Brompton at gear ratio 4.9... the energy required to maintain cadence at this gearing is even higher compared to the highest gear on my Tern. Is there a direct correlation between energy required vs gear ratio?

2) At the same gear inch, all things equal (Tern gear ratio 3.1 vs Brompton gear ratio 4.2), given different wheel sizes, is the energy required to maintain cadence the same?

I always find it much tougher to cycle on Brompton than on my Tern.

Things to note

The lowest gear inches on my brompton is smaller than the smallest gear inches on my Tern. Conversely, the highest gear ratio on my Brompton is also higher than the highest gear inches on my Tern! The gear spread on my Brompton is quite staggering... I have never used gear ratio 6.5 because I don't think its humanly possible to peddle.

Given the data presented and from a layman perspective, does one still get to cycle faster on the brompton since the cost is 2x the amount versus the tern with same amount of effort used. Well the tern cost more than the Aleoca and is faster. Same goes for tyrell, cost more than the tern but is faster.

 

[leinad]

next MO opening up!

decided that it will be from bike24, I will order it from next month or so (around September.) shipping costs will be split according to the value of items purchased.


closure once it hits 380 sgd or so (with shipping included)

Put foot in. I think my friend wants to get the Bryton you got. =) Will confirm with him and then let you know either way.

/Dan

 

[leinad]

Does anyone know where we can get a set of these 31.8mm clamp on cable guides in Singapore?

/Dan

 

[luei74]

I just fell down and have a bad cut. Somebody put small offerings and burnt hell money right in the middle of the PCN at Tanjong Rhu/Mountbatten.

Great welcome to the 7th month.

Still trying to stop the bleeding for the past one hour.

Take care Bro...if the blood never stop after one hour better go to the hospital ti get better treatment..speedy recovery

 

[DeadmanINC]

Think this month siam cycling don't ji siao gd brothers

 

[rarenick]

Do u all apply sunblock on your neck / face? I can wear sleeves n long slacks but the helmet straps are causing marks on my neck. Back of neck is very tanned as well.

Sent from Xiaomi MI 4I using GAGT

 

[fatfleaz]

Do u all apply sunblock on your neck / face? I can wear sleeves n long slacks but the helmet straps are causing marks on my neck. Back of neck is very tanned as well.

Sent from Xiaomi MI 4I using GAGT

I apply sunblock religiously

 

[IronMac]

Do u all apply sunblock on your neck / face? I can wear sleeves n long slacks but the helmet straps are causing marks on my neck. Back of neck is very tanned as well.

Yes, I do. Youngsters don't think about skin cancer.

 

[binary_0011]

I apply sunblock religiously

that guy cycled for 20 yrs liao and yet he asked this kind of question...

 

[IronMac]

Just got back from a ride. I came across this cyclist while down in Pasir Ris farmway area. He was walking his bike along the road. So, I asked if he was okay? He said that his pedal was spoilt.

I continued on, thinking that I don't really know how to fix pedals but after a minute or so I decided to go back to see what I can do. It turns out that the bolt holding his left side crank arm had come out.

It looked like it needed a hex wrench or allen key to reattach it. I whipped out my Topeak Alien II multi tool, searched for the right sized allen key and reattached the crank arm. I figure it would hold long enough for him to get home if he pedaled very carefully.

The Alien is a great multi tool and I have never regretted purchasing it. Learn how to do simple repairs and look out for one another on the roads.

 

[erwinrommel]

Hope it isn't too bad. Speedy recovery man...

Sent from the right side of my brain because I will never be caught using GAGT

ouch..! take care man!

Woah get well soon fren. Hope u are able to sleep tonite

Get off the computer and go rest! Speedy recovery!

Thanks all for the kind words. Need about 3 stitches and MC 2 days. There are signs that the wound maybe infected... Keeping fingers crossed.

 

[erwinrommel]

hmm for me it seems to be all the same.

Mini velo 53 paired to 12-25 8 speeds

I dont use the last 4 cogs gear ratio (6.2- 4.4) always on the first two.

Time trial bike 650c 53/39 paired to 12-25 10 speeds

usually around the middle to lower (6.9-5.7)

Road bike 53/39 paired to 11-28 11 speeds

usually around 15T or 17t (6.9-6.1)

I do have Cadence and HRM to measure my cadence, my cadence is around 90 average though . my mini velo and time trial bike are hard to ride due to the wheel not being true. mini velo seems to be the slowest for the effort.

I don't really quite get your numbers. Are you referring to gear metres or gear ratio?

I calculated your 53T 12-25 8 speed cassette...

Unless you are using 22 inch wheels, you should be able to easily outspin 53/12 on 20" tyres.

So my question is that given is the energy required to reach similar gear ratio on both bikes the same given that all others are equal (crank, etc) except the wheel size?

And secondly, at similar gear inch/metres, would the energy required to maintain the same for both bikes?

I know its difficult to do a comparison "with all other things equal" when everything is different.

I just cannot explain why I huff and puff like crazy on my 16" Brompton while my 22" Tern seems to be a breeze when it comes to long distances.

 

[erwinrommel]

Given the data presented and from a layman perspective, does one still get to cycle faster on the brompton since the cost is 2x the amount versus the tern with same amount of effort used. Well the tern cost more than the Aleoca and is faster. Same goes for tyrell, cost more than the tern but is faster.

I don't think you can correlate the amount of money spent on bicycle with the speed.

You might as well say you get an entry level roadie which is cheaper than a mid range Tern.

So far, I dunno of any folding bicycle in the market right now that folds as compact as Brompton, and easily rolls around even after folding. Even if you count the Brompton clone MIT, it is still relative expensive and the folded size is still too big.

I keep my Brompton under the Ikea Galant table. The width of the table is only 60cm.

The only problem I have with Brompton is the gearing. If I have very powerful legs, it can easily go very fast.

Even on my Brompton 5th gear, the average speed with 80-90 rpm is about 28kmh. I can never use 6th gear...

 

[Sadisticnoob]

I don't really quite get your numbers. Are you referring to gear metres or gear ratio?

I calculated your 53T 12-25 8 speed cassette...

Unless you are using 22 inch wheels, you should be able to easily outspin 53/12 on 20" tyres.

So my question is that given is the energy required to reach similar gear ratio on both bikes the same given that all others are equal (crank, etc) except the wheel size?

And secondly, at similar gear inch/metres, would the energy required to maintain the same for both bikes?

I know its difficult to do a comparison "with all other things equal" when everything is different.

I just cannot explain why I huff and puff like crazy on my 16" Brompton while my 22" Tern seems to be a breeze when it comes to long distances.

I shall use gear inches to measure since its a common measurment .

highllighted in pink are favourite gears to use.


The road bike and tt bike are somewhat similar easy to pedal, both using ultegra (one is 10 speed the other is 11 speed)

The toptube+ stem length is almost the same for my road bike and mini velo (635mm) somewhat similar saddle height (69X mm ) only thing different is the quality of the equipment.

I find the mini velo hard to pedal, could be due to brake rub and wheel truenesss and equipment quality.

I cant make a fair judgement till i changed to a higher grade equipment and somewhat better quality equipment.

energy used would defintely be different, only way to measure would be to mount a powermeter and ride at a certain speed