MAC 7T ?!?!

[olemetry]

Cell_man tells me he now has a 7T motor. I have read anything about here so I just figured I would bring it up. I am planning on a 29er build, at this point neptronix has pretty much sold me on getting an 8T as he is worried that the 6T at 48V on a 29er may be too much and burn up the motor. But now there is a 7T. What do yall think about a 7T at 48V on a 29er. Keep in mind that there are absolutely no hills where I live (NOLA) - none. And I do not plan on going full throtlle for any length of time (no more than 1 minute). Do you think the 7T would be a good motor to try? I hear the 8T at 12S may put me around 30mph (which is plenty fast for me), but there are times I will want to just pull ahead of my stinkpot (49cc) friend who tops at about 30mph - just to remind him the power of a volt-ampere or two. Thanks yall.

[Racer_X]

Go for it, because it sounds like you already made up your mind. Then let us know the result.

[parajared]

I ended up with a 9c, but have always been intrested in MAC.
My 9c is great for the mildly hilly stuff, but suffers when I try to take it on hilly trail rides. From what I hear MAC is the way to go for both torque and speed.
7T sounds like a good all-arounder.

[neptronix]

Yo! on a 29er, your 8T in a 700c with those tall tires will definitely pull over 30mph on 12s, especially at the top of the charge. I've done 31-32mph on a 26" wheel fully charged on 12S lipo + an 8T. You might edge into 33-34mph on that big wheel.

Make sure you run a good amount of lipo in parallel to keep the voltage nice and high. It will need a good amount of amps.

7T is ok on 12S with that wheel size. You should be pulling mid 30's.
BTW 12S is 46v nominal, not 48, but very close.

Make sure you get a 12FET controller for sure. You won't regret it.
Being in the dominant position over 50cc stinkers and bicyclists is important. I know that you will not have a problem.

Cell_man tells me he now has a 7T motor. I have read anything about here so I just figured I would bring it up. I am planning on a 29er build, at this point neptronix has pretty much sold me on getting an 8T as he is worried that the 6T at 48V on a 29er may be too much and burn up the motor. But now there is a 7T. What do yall think about a 7T at 48V on a 29er. Keep in mind that there are absolutely no hills where I live (NOLA) - none. And I do not plan on going full throtlle for any length of time (no more than 1 minute). Do you think the 7T would be a good motor to try? I hear the 8T at 12S may put me around 30mph (which is plenty fast for me), but there are times I will want to just pull ahead of my stinkpot (49cc) friend who tops at about 30mph - just to remind him the power of a volt-ampere or two. Thanks yall.

[olemetry]

All good stuff!! Thanks again for all yalls help. I will let know how things are going in a few weeks -- (when I have a whole new batch of questions). Thanks again yall!!

[Mudduck]

I just ordered a 7t Mac but I'm going to run it on a 26" rim.i don't know how it would do with you 29er?I live in mostly flat land too..I should have it in 2 weeks..I hope.

[mrdavies]

I have the 6t running 12s on a 29er... It's GREAT. I recommend the 700c wheel. As its top speed is around 38 mph with pedaling. The 29er is great for going over bumps in the road. Very smooth.
Good luck

[Wizzbit]

What is a 29er?

[Mudduck]

A 28" wheel..

[Wizzbit]

A 28" wheel..

oh lol, thanks

[neptronix]

erm, isn't it at 700c wheel with a 2in. tire on it?

That is what many bicycle shops have told me.
Bicycle wheel sizes are based off the total diameter of the expected tire plus the rim itself.

So for example, a 20" wheel in bike terms is a 16" wheel in motorcycle terms, because there is usually a gigantic tire on the thing.

[Polerkongen]

Seems like I`m the only one who has the 7T for the moment, but seems like others have ordered and are awaiting for it to arrive.

I have it in a 26 inch MTB on 12s lipo with a 12fet controller, it runs 33mph on the flat with Pauls standard controller settings.

To me it seems it has plenty of torque, but its my first build. 33mph is the limit for how fast I want to ride, and even there its quite spooky (and windy)

I love it!

[Wizzbit]

Seems like I`m the only one who has the 7T for the moment, but seems like others have ordered and are awaiting for it to arrive.

I have it in a 26 inch MTB on 12s lipo with a 12fet controller, it runs 33mph on the flat with Pauls standard controller settings.

To me it seems it has plenty of torque, but its my first build. 33mph is the limit for how fast I want to ride, and even there its quite spooky (and windy)

I love it!

Sounds like a great set up

[Polerkongen]

Seems like I`m the only one who has the 7T for the moment, but seems like others have ordered and are awaiting for it to arrive.

I have it in a 26 inch MTB on 12s lipo with a 12fet controller, it runs 33mph on the flat with Pauls standard controller settings.

To me it seems it has plenty of torque, but its my first build. 33mph is the limit for how fast I want to ride, and even there its quite spooky (and windy)

I love it!

Sounds like a great set up

Yeah also did a lot of reading before buying, have the four 8Ah bloks and the controller in a triangle bag from Paul, so no visual wires and stuff. But always have the zipper open 10cm when driving so the controller dont get hot. And its so easy when only 12s charge and connect with parallel cables.

[Wizzbit]

Seems like I`m the only one who has the 7T for the moment, but seems like others have ordered and are awaiting for it to arrive.

I have it in a 26 inch MTB on 12s lipo with a 12fet controller, it runs 33mph on the flat with Pauls standard controller settings.

To me it seems it has plenty of torque, but its my first build. 33mph is the limit for how fast I want to ride, and even there its quite spooky (and windy)

I love it!

Sounds like a great set up

Yeah also did a lot of reading before buying, have the four 8Ah bloks and the controller in a triangle bag from Paul, so no visual wires and stuff. But always have the zipper open 10cm when driving so the controller dont get hot. And its so easy when only 12s charge and connect with parallel cables.

Ive done a whole lot of reading and asking questions to decide the right kit, I knew virtually nothing about ebikes when I joined up here, finally decided on cellman mac kit with the 52v triangle battery, I'm opting for the 8T as it will still get 30mph+ with the 52v a123.

[TonyReynolds]

erm, isn't it at 700c wheel with a 2in. tire on it?

That is what many bicycle shops have told me.
Bicycle wheel sizes are based off the total diameter of the expected tire plus the rim itself.

So for example, a 20" wheel in bike terms is a 16" wheel in motorcycle terms, because there is usually a gigantic tire on the thing.

Technically the rim is 622mm by whatever the INSIDE rim width is (typically 18-20mm). "29er" is a marketing term, not necessarily reality, but that said, my 622 rim, plus a 2.0" (50mm Schwalbe) tire is very close to 29" in diameter. Here's an article about it:

http://en.wikipedia.org/wiki/29er_(bicycle)



(29er on left, 26" on right)

[neptronix]

OK, seems like what we consider 700c in the states. Bicycle wheel sizes should be like motorcycle sizes.. rated by the outside rim diameter only. silly

[Polerkongen]

Ive done a whole lot of reading and asking questions to decide the right kit, I knew virtually nothing about ebikes when I joined up here, finally decided on cellman mac kit with the 52v triangle battery, I'm opting for the 8T as it will still get 30mph+ with the 52v a123.

When a 29 inch I too would choose an 8T, in strong headwinds i can definelty feel the 7T is a high speed wind. So the 8T must be perfect for you.

I spend a lot of time trying to decide the battery setup, but having the oppertunity to hide the controller and all the wires in the triangle made me go lipo, thats the main reason. It ended up costing the same and with 16Ah, I only have 2Ah more than Pauls a123 when 15% being left in the lipo bricks.

[Wizzbit]

Ive done a whole lot of reading and asking questions to decide the right kit, I knew virtually nothing about ebikes when I joined up here, finally decided on cellman mac kit with the 52v triangle battery, I'm opting for the 8T as it will still get 30mph+ with the 52v a123.

When a 29 inch I too would choose an 8T, in strong headwinds i can definelty feel the 7T is a high speed wind. So the 8T must be perfect for you.

I spend a lot of time trying to decide the battery setup, but having the oppertunity to hide the controller and all the wires in the triangle made me go lipo, thats the main reason. It ended up costing the same and with 16Ah, I only have 2Ah more than Pauls a123 when 15% being left in the lipo bricks.

I got a 26" wheel, I nearly went lipo but decided on a123 because its simpler and they last longer, I guess IL camoflage my wires along the brake cable/gear cable.

[AmpeD]

Hi guys im in a similar dilemma with choosing between a 7t and 8t on a 26" but at 72v with 20amphrs what spec motor would be more suitable?

[Wizzbit]

Hi guys im in a similar dilemma with choosing between a 7t and 8t on a 26" but at 72v with 20amphrs what spec motor would be more suitable?

Well you've got plenty of power with that battery, it depends how fast you wanna go and what hills you wanna climb, but cell has told me expect 50kph on 8t with 52v a123, so you can expect serious speeds with a 72v, I would go 8t with those v's.
As for myself I'm just about to place my order with cell and deciding between 7t and 8t, but leaning towards 8t on neptronix recommendation, hmm little more torquey or little more speedy??

[olemetry]

one option that cell-man offers is this:

DCDC (component only), 3A OP, adjustable DC out, max 48V pack- 10USD

uhh, what is this? i can't make heads or tails of it. anyone have a idea?

[docnjoj]

It is a DC/D/C converter to bring the 48 volt battery down to 12 volts for lights and accessories. It is good for up to 3amps out at 12V.
otherDoc

[neptronix]

Hi guys im in a similar dilemma with choosing between a 7t and 8t on a 26" but at 72v with 20amphrs what spec motor would be more suitable?

10T or 12T.

On an 8T, you'll hit 46mph and the motor will burn up or your gears will melt.
Check the ebikes.ca simulator - that's 3000-5000w.

You don't want to exceed 40mph on these motors. 35mph is already pushing it.

[olemetry]

What motor should we select in the simulator for MAC's 7T, 8T, 10T, etc.? ALso what type of battery characteristics should I use for 12s lipo?